XJ engine instantly revs out at start up
10-07-2007, 11:27 AM
#11
Guest
Posts: n/a
Re: XJ engine instantly revs out at start up
the intake manifold is not on the pegsand not matting flat to the head and
you have a major vacumm leak
Glenn wrote:
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
you have a major vacumm leak
Glenn wrote:
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
10-07-2007, 11:27 AM
#12
Guest
Posts: n/a
Re: XJ engine instantly revs out at start up
the intake manifold is not on the pegsand not matting flat to the head and
you have a major vacumm leak
Glenn wrote:
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
you have a major vacumm leak
Glenn wrote:
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
10-07-2007, 11:27 AM
#13
Guest
Posts: n/a
Re: XJ engine instantly revs out at start up
the intake manifold is not on the pegsand not matting flat to the head and
you have a major vacumm leak
Glenn wrote:
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
you have a major vacumm leak
Glenn wrote:
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
10-07-2007, 11:42 AM
#14
Guest
Posts: n/a
Re: Re: XJ engine instantly revs out at start up
On Sun, 07 Oct 2007 10:36:26 -0400, Mike Romain <romainm@sympatico.ca>
wrote:
>That usually means you forgot to hook up a vacuum line. You have an air
>leak into the intake someplace likely.
It is going to take more than a small vacum line to do that. Maybe the
line forvacuum power brake booster could cause that but you have a
major air/acuum leak somewhere and this is what you should look for.
not a simple small line.
-----------------
TheSnoMan.com
wrote:
>That usually means you forgot to hook up a vacuum line. You have an air
>leak into the intake someplace likely.
It is going to take more than a small vacum line to do that. Maybe the
line forvacuum power brake booster could cause that but you have a
major air/acuum leak somewhere and this is what you should look for.
not a simple small line.
-----------------
TheSnoMan.com
10-07-2007, 11:42 AM
#15
Guest
Posts: n/a
Re: Re: XJ engine instantly revs out at start up
On Sun, 07 Oct 2007 10:36:26 -0400, Mike Romain <romainm@sympatico.ca>
wrote:
>That usually means you forgot to hook up a vacuum line. You have an air
>leak into the intake someplace likely.
It is going to take more than a small vacum line to do that. Maybe the
line forvacuum power brake booster could cause that but you have a
major air/acuum leak somewhere and this is what you should look for.
not a simple small line.
-----------------
TheSnoMan.com
wrote:
>That usually means you forgot to hook up a vacuum line. You have an air
>leak into the intake someplace likely.
It is going to take more than a small vacum line to do that. Maybe the
line forvacuum power brake booster could cause that but you have a
major air/acuum leak somewhere and this is what you should look for.
not a simple small line.
-----------------
TheSnoMan.com
10-07-2007, 11:42 AM
#16
Guest
Posts: n/a
Re: Re: XJ engine instantly revs out at start up
On Sun, 07 Oct 2007 10:36:26 -0400, Mike Romain <romainm@sympatico.ca>
wrote:
>That usually means you forgot to hook up a vacuum line. You have an air
>leak into the intake someplace likely.
It is going to take more than a small vacum line to do that. Maybe the
line forvacuum power brake booster could cause that but you have a
major air/acuum leak somewhere and this is what you should look for.
not a simple small line.
-----------------
TheSnoMan.com
wrote:
>That usually means you forgot to hook up a vacuum line. You have an air
>leak into the intake someplace likely.
It is going to take more than a small vacum line to do that. Maybe the
line forvacuum power brake booster could cause that but you have a
major air/acuum leak somewhere and this is what you should look for.
not a simple small line.
-----------------
TheSnoMan.com
10-07-2007, 11:42 AM
#17
Guest
Posts: n/a
Re: Re: XJ engine instantly revs out at start up
On Sun, 07 Oct 2007 10:36:26 -0400, Mike Romain <romainm@sympatico.ca>
wrote:
>That usually means you forgot to hook up a vacuum line. You have an air
>leak into the intake someplace likely.
It is going to take more than a small vacum line to do that. Maybe the
line forvacuum power brake booster could cause that but you have a
major air/acuum leak somewhere and this is what you should look for.
not a simple small line.
-----------------
TheSnoMan.com
wrote:
>That usually means you forgot to hook up a vacuum line. You have an air
>leak into the intake someplace likely.
It is going to take more than a small vacum line to do that. Maybe the
line forvacuum power brake booster could cause that but you have a
major air/acuum leak somewhere and this is what you should look for.
not a simple small line.
-----------------
TheSnoMan.com
10-07-2007, 12:18 PM
#18
Guest
Posts: n/a
Re: XJ engine instantly revs out at start up
Does the throttle not open at all, or is it opened all of the way already?
Me thinks the latter is the case.
"Glenn" <jeepthing66@hotmail.com> wrote in message
news:1191757548.916842.97010@50g2000hsm.googlegrou ps.com...
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
>
Me thinks the latter is the case.
"Glenn" <jeepthing66@hotmail.com> wrote in message
news:1191757548.916842.97010@50g2000hsm.googlegrou ps.com...
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
>
10-07-2007, 12:18 PM
#19
Guest
Posts: n/a
Re: XJ engine instantly revs out at start up
Does the throttle not open at all, or is it opened all of the way already?
Me thinks the latter is the case.
"Glenn" <jeepthing66@hotmail.com> wrote in message
news:1191757548.916842.97010@50g2000hsm.googlegrou ps.com...
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
>
Me thinks the latter is the case.
"Glenn" <jeepthing66@hotmail.com> wrote in message
news:1191757548.916842.97010@50g2000hsm.googlegrou ps.com...
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
>
10-07-2007, 12:18 PM
#20
Guest
Posts: n/a
Re: XJ engine instantly revs out at start up
Does the throttle not open at all, or is it opened all of the way already?
Me thinks the latter is the case.
"Glenn" <jeepthing66@hotmail.com> wrote in message
news:1191757548.916842.97010@50g2000hsm.googlegrou ps.com...
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
>
Me thinks the latter is the case.
"Glenn" <jeepthing66@hotmail.com> wrote in message
news:1191757548.916842.97010@50g2000hsm.googlegrou ps.com...
> Hi all, was trying to be a good brother today doing a major service
> and repairing the cracked exhaust manifold on my sisters 99XJ.
> Repairing the exhaust manifold obviously entails taking of the inlet
> manifold, unplugging all the wires, fuel line off the fuel rail etc.
> Everything went back together ok but when I fired it up, the engine
> raced to max revs instantly, pretty sure it would rev till blew up
> from the sound of it if I didn't switch it off. I can't understand how
> it could do this, particularly since the throttle butterfly does not
> open at all. I tried resetting the computer, no luck, I'm out of ideas
> at the moment other than towing it to the nearest Jeep dealer, Any
> idea's anyone???
>