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Cherokee fuel press
Guys, if You don't help, nobody will.
I have a '92 Jeep Cherokee 4.0 which has had a stalling problem for a few years which no one can seem to fix. Any help would be greatly appreciated. Let's get started. When it comes to 2250 rpm (under load or acceleration) seems like someone pinched the fuel line and it just doesn't want to accelerate. After a while, 3-4 seconds, it accelerates like nothing was wrong. So, I've been writing to all you guys before and after all answers, I tried to check everything possible before ask again. It took some time because I'm seaman and mostly on a ship but after replacing part by part, here I am, back here. First, new fuel pressure regulator... nothing happened, then oxygen sensor (it seemed like it measures wrong values), still same. New fuel filter (yesterday), still same. In Haynes manual I found how to test fuel press and I have just done the same and found: With or without vacuum line attached, pressure is 22 psi. So, I tried to drive around with gauge connected and mounted inside the cabin. Happens that in the moment of "stalling" press drops to 18 psi (!?). When it comes to my 22, things goes fine. But nothing like in Haynes about 31 to even 39 psi!? I tried to pinch return hose (possible only down before tank, everywhere is a plastic hose) and nothing changed, it stays on 22. Few months ago, even a fuel pump was removed and I expected dirty inlet filter (one like a nylon bag) but nothing was wrong, clean and fine filter found. One more thing, it happens even with a full tank of gas. Please, this group is my only and last hope. I like this car but the damn thing just doesn't want to perform like it should. Many thanks and greetings from Croatia, Europe. |
Re: Cherokee fuel press
Weak fuel pump.
Spdloader "Davey" <davey@hi.t-com.hr> wrote in message news:e2dvo7$hl2$1@ss408.t-com.hr... > Guys, if You don't help, nobody will. > I have a '92 Jeep Cherokee 4.0 which has had a stalling problem > for a few years which no one can seem to fix. Any help would be greatly > appreciated. > Let's get started. When it comes to 2250 rpm (under load or acceleration) > seems like someone pinched the fuel line and it just doesn't want to > accelerate. After a while, 3-4 seconds, it accelerates like nothing was > wrong. > So, I've been writing to all you guys before and after all answers, I > tried to check everything possible before ask again. It took some time > because I'm seaman and mostly on a ship but after replacing part by part, > here I am, back here. > First, new fuel pressure regulator... nothing happened, then oxygen > sensor (it seemed like it measures wrong values), still same. > New fuel filter (yesterday), still same. > In Haynes manual I found how to test fuel press and I have just done the > same and found: > With or without vacuum line attached, pressure is 22 psi. So, I tried to > drive around with gauge connected and mounted inside the cabin. Happens > that in the moment of "stalling" press drops to 18 psi (!?). When it comes > to my 22, things goes fine. > But nothing like in Haynes about 31 to even 39 psi!? > I tried to pinch return hose (possible only down before tank, everywhere > is a plastic hose) and nothing changed, it stays on 22. > Few months ago, even a fuel pump was removed and I expected dirty inlet > filter (one like a nylon bag) but nothing was wrong, clean and fine filter > found. > One more thing, it happens even with a full tank of gas. > Please, this group is my only and last hope. I like this car but the damn > thing just doesn't want to perform like it should. > Many thanks and greetings from Croatia, Europe. |
Re: Cherokee fuel press
Weak fuel pump.
Spdloader "Davey" <davey@hi.t-com.hr> wrote in message news:e2dvo7$hl2$1@ss408.t-com.hr... > Guys, if You don't help, nobody will. > I have a '92 Jeep Cherokee 4.0 which has had a stalling problem > for a few years which no one can seem to fix. Any help would be greatly > appreciated. > Let's get started. When it comes to 2250 rpm (under load or acceleration) > seems like someone pinched the fuel line and it just doesn't want to > accelerate. After a while, 3-4 seconds, it accelerates like nothing was > wrong. > So, I've been writing to all you guys before and after all answers, I > tried to check everything possible before ask again. It took some time > because I'm seaman and mostly on a ship but after replacing part by part, > here I am, back here. > First, new fuel pressure regulator... nothing happened, then oxygen > sensor (it seemed like it measures wrong values), still same. > New fuel filter (yesterday), still same. > In Haynes manual I found how to test fuel press and I have just done the > same and found: > With or without vacuum line attached, pressure is 22 psi. So, I tried to > drive around with gauge connected and mounted inside the cabin. Happens > that in the moment of "stalling" press drops to 18 psi (!?). When it comes > to my 22, things goes fine. > But nothing like in Haynes about 31 to even 39 psi!? > I tried to pinch return hose (possible only down before tank, everywhere > is a plastic hose) and nothing changed, it stays on 22. > Few months ago, even a fuel pump was removed and I expected dirty inlet > filter (one like a nylon bag) but nothing was wrong, clean and fine filter > found. > One more thing, it happens even with a full tank of gas. > Please, this group is my only and last hope. I like this car but the damn > thing just doesn't want to perform like it should. > Many thanks and greetings from Croatia, Europe. |
Re: Cherokee fuel press
Weak fuel pump.
Spdloader "Davey" <davey@hi.t-com.hr> wrote in message news:e2dvo7$hl2$1@ss408.t-com.hr... > Guys, if You don't help, nobody will. > I have a '92 Jeep Cherokee 4.0 which has had a stalling problem > for a few years which no one can seem to fix. Any help would be greatly > appreciated. > Let's get started. When it comes to 2250 rpm (under load or acceleration) > seems like someone pinched the fuel line and it just doesn't want to > accelerate. After a while, 3-4 seconds, it accelerates like nothing was > wrong. > So, I've been writing to all you guys before and after all answers, I > tried to check everything possible before ask again. It took some time > because I'm seaman and mostly on a ship but after replacing part by part, > here I am, back here. > First, new fuel pressure regulator... nothing happened, then oxygen > sensor (it seemed like it measures wrong values), still same. > New fuel filter (yesterday), still same. > In Haynes manual I found how to test fuel press and I have just done the > same and found: > With or without vacuum line attached, pressure is 22 psi. So, I tried to > drive around with gauge connected and mounted inside the cabin. Happens > that in the moment of "stalling" press drops to 18 psi (!?). When it comes > to my 22, things goes fine. > But nothing like in Haynes about 31 to even 39 psi!? > I tried to pinch return hose (possible only down before tank, everywhere > is a plastic hose) and nothing changed, it stays on 22. > Few months ago, even a fuel pump was removed and I expected dirty inlet > filter (one like a nylon bag) but nothing was wrong, clean and fine filter > found. > One more thing, it happens even with a full tank of gas. > Please, this group is my only and last hope. I like this car but the damn > thing just doesn't want to perform like it should. > Many thanks and greetings from Croatia, Europe. |
Re: Cherokee fuel press
I would be looking at the connection on the throttle position sensor
first. I use a spray contact cleaner on the connections on mine. WD40 will work as a connection cleaner too. They are a rheostat and can get a dead spot, but their electrical connection can cause hiccups like you describe too. You can use a multimeter on ohms and take the readings as you open the throttle with it unplugged and the engine off. It should change evenly. If the resistance bumps, you likely have found the trouble. I hear you can clean the guts of the TPS too, but have never needed to. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Davey wrote: > > Guys, if You don't help, nobody will. > I have a '92 Jeep Cherokee 4.0 which has had a stalling problem > for a few years which no one can seem to fix. Any help would be greatly > appreciated. > Let's get started. When it comes to 2250 rpm (under load or > acceleration) seems like someone pinched the fuel line and it just > doesn't want to accelerate. After a while, 3-4 seconds, it accelerates > like nothing was wrong. > So, I've been writing to all you guys before and after all answers, I > tried to check everything possible before ask again. It took some time > because I'm seaman and mostly on a ship but after replacing part by > part, here I am, back here. > First, new fuel pressure regulator... nothing happened, then oxygen > sensor (it seemed like it measures wrong values), still same. > New fuel filter (yesterday), still same. > In Haynes manual I found how to test fuel press and I have just done the > same and found: > With or without vacuum line attached, pressure is 22 psi. So, I tried to > drive around with gauge connected and mounted inside the cabin. Happens > that in the moment of "stalling" press drops to 18 psi (!?). When it > comes to my 22, things goes fine. > But nothing like in Haynes about 31 to even 39 psi!? > I tried to pinch return hose (possible only down before tank, everywhere > is a plastic hose) and nothing changed, it stays on 22. > Few months ago, even a fuel pump was removed and I expected dirty inlet > filter (one like a nylon bag) but nothing was wrong, clean and fine > filter found. > One more thing, it happens even with a full tank of gas. > Please, this group is my only and last hope. I like this car but the > damn thing just doesn't want to perform like it should. > Many thanks and greetings from Croatia, Europe. |
Re: Cherokee fuel press
I would be looking at the connection on the throttle position sensor
first. I use a spray contact cleaner on the connections on mine. WD40 will work as a connection cleaner too. They are a rheostat and can get a dead spot, but their electrical connection can cause hiccups like you describe too. You can use a multimeter on ohms and take the readings as you open the throttle with it unplugged and the engine off. It should change evenly. If the resistance bumps, you likely have found the trouble. I hear you can clean the guts of the TPS too, but have never needed to. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Davey wrote: > > Guys, if You don't help, nobody will. > I have a '92 Jeep Cherokee 4.0 which has had a stalling problem > for a few years which no one can seem to fix. Any help would be greatly > appreciated. > Let's get started. When it comes to 2250 rpm (under load or > acceleration) seems like someone pinched the fuel line and it just > doesn't want to accelerate. After a while, 3-4 seconds, it accelerates > like nothing was wrong. > So, I've been writing to all you guys before and after all answers, I > tried to check everything possible before ask again. It took some time > because I'm seaman and mostly on a ship but after replacing part by > part, here I am, back here. > First, new fuel pressure regulator... nothing happened, then oxygen > sensor (it seemed like it measures wrong values), still same. > New fuel filter (yesterday), still same. > In Haynes manual I found how to test fuel press and I have just done the > same and found: > With or without vacuum line attached, pressure is 22 psi. So, I tried to > drive around with gauge connected and mounted inside the cabin. Happens > that in the moment of "stalling" press drops to 18 psi (!?). When it > comes to my 22, things goes fine. > But nothing like in Haynes about 31 to even 39 psi!? > I tried to pinch return hose (possible only down before tank, everywhere > is a plastic hose) and nothing changed, it stays on 22. > Few months ago, even a fuel pump was removed and I expected dirty inlet > filter (one like a nylon bag) but nothing was wrong, clean and fine > filter found. > One more thing, it happens even with a full tank of gas. > Please, this group is my only and last hope. I like this car but the > damn thing just doesn't want to perform like it should. > Many thanks and greetings from Croatia, Europe. |
Re: Cherokee fuel press
I would be looking at the connection on the throttle position sensor
first. I use a spray contact cleaner on the connections on mine. WD40 will work as a connection cleaner too. They are a rheostat and can get a dead spot, but their electrical connection can cause hiccups like you describe too. You can use a multimeter on ohms and take the readings as you open the throttle with it unplugged and the engine off. It should change evenly. If the resistance bumps, you likely have found the trouble. I hear you can clean the guts of the TPS too, but have never needed to. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Davey wrote: > > Guys, if You don't help, nobody will. > I have a '92 Jeep Cherokee 4.0 which has had a stalling problem > for a few years which no one can seem to fix. Any help would be greatly > appreciated. > Let's get started. When it comes to 2250 rpm (under load or > acceleration) seems like someone pinched the fuel line and it just > doesn't want to accelerate. After a while, 3-4 seconds, it accelerates > like nothing was wrong. > So, I've been writing to all you guys before and after all answers, I > tried to check everything possible before ask again. It took some time > because I'm seaman and mostly on a ship but after replacing part by > part, here I am, back here. > First, new fuel pressure regulator... nothing happened, then oxygen > sensor (it seemed like it measures wrong values), still same. > New fuel filter (yesterday), still same. > In Haynes manual I found how to test fuel press and I have just done the > same and found: > With or without vacuum line attached, pressure is 22 psi. So, I tried to > drive around with gauge connected and mounted inside the cabin. Happens > that in the moment of "stalling" press drops to 18 psi (!?). When it > comes to my 22, things goes fine. > But nothing like in Haynes about 31 to even 39 psi!? > I tried to pinch return hose (possible only down before tank, everywhere > is a plastic hose) and nothing changed, it stays on 22. > Few months ago, even a fuel pump was removed and I expected dirty inlet > filter (one like a nylon bag) but nothing was wrong, clean and fine > filter found. > One more thing, it happens even with a full tank of gas. > Please, this group is my only and last hope. I like this car but the > damn thing just doesn't want to perform like it should. > Many thanks and greetings from Croatia, Europe. |
Re: Cherokee fuel press
Mike Romain wrote:
> I would be looking at the connection on the throttle position sensor > first. I use a spray contact cleaner on the connections on mine. WD40 > will work as a connection cleaner too. > > They are a rheostat and can get a dead spot, but their electrical > connection can cause hiccups like you describe too. You can use a > multimeter on ohms and take the readings as you open the throttle with > it unplugged and the engine off. It should change evenly. If the > resistance bumps, you likely have found the trouble. > > I hear you can clean the guts of the TPS too, but have never needed to. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > Canadian Off Road Trips Photos: Non members can still view! > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 > (More Off Road album links at bottom of the view page) > Few months ago, Jeep was at authorised workshop and guy hooked it up on some kind a multitester for Chrysler/Jeep and complete test passed through all of electronic items and found nothing wrong. Guy told me he has no time to drive around with "tester thing" so we couldn't see what happens when it comes to loaded 2250 rpm. Mike, what about this fuel pressure, can it be just a damn pump? Logically, when you pinch return hose, pressure should jump very fast, right? |
Re: Cherokee fuel press
Mike Romain wrote:
> I would be looking at the connection on the throttle position sensor > first. I use a spray contact cleaner on the connections on mine. WD40 > will work as a connection cleaner too. > > They are a rheostat and can get a dead spot, but their electrical > connection can cause hiccups like you describe too. You can use a > multimeter on ohms and take the readings as you open the throttle with > it unplugged and the engine off. It should change evenly. If the > resistance bumps, you likely have found the trouble. > > I hear you can clean the guts of the TPS too, but have never needed to. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > Canadian Off Road Trips Photos: Non members can still view! > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 > (More Off Road album links at bottom of the view page) > Few months ago, Jeep was at authorised workshop and guy hooked it up on some kind a multitester for Chrysler/Jeep and complete test passed through all of electronic items and found nothing wrong. Guy told me he has no time to drive around with "tester thing" so we couldn't see what happens when it comes to loaded 2250 rpm. Mike, what about this fuel pressure, can it be just a damn pump? Logically, when you pinch return hose, pressure should jump very fast, right? |
Re: Cherokee fuel press
Mike Romain wrote:
> I would be looking at the connection on the throttle position sensor > first. I use a spray contact cleaner on the connections on mine. WD40 > will work as a connection cleaner too. > > They are a rheostat and can get a dead spot, but their electrical > connection can cause hiccups like you describe too. You can use a > multimeter on ohms and take the readings as you open the throttle with > it unplugged and the engine off. It should change evenly. If the > resistance bumps, you likely have found the trouble. > > I hear you can clean the guts of the TPS too, but have never needed to. > > Mike > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 > 88 Cherokee 235 BFG AT's > Canadian Off Road Trips Photos: Non members can still view! > Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 > (More Off Road album links at bottom of the view page) > Few months ago, Jeep was at authorised workshop and guy hooked it up on some kind a multitester for Chrysler/Jeep and complete test passed through all of electronic items and found nothing wrong. Guy told me he has no time to drive around with "tester thing" so we couldn't see what happens when it comes to loaded 2250 rpm. Mike, what about this fuel pressure, can it be just a damn pump? Logically, when you pinch return hose, pressure should jump very fast, right? |
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