Rough Idle 94 GC 4L 6 cyl
05-11-2010, 10:11 PM
#1
Junior Member
Thread Starter
Join Date: Mar 2010
Posts: 15
Rough Idle 94 GC 4L 6 cyl
hi,
My 94 GC idles really rough , 4L 6 cyl.
I rev her up above 1000 rpm and its smooooooooth.
Only rough when idling.
Just replaced the fuel pump thinking that would fix it, but it didnt.
any suggestions?
Gato
My 94 GC idles really rough , 4L 6 cyl.
I rev her up above 1000 rpm and its smooooooooth.
Only rough when idling.
Just replaced the fuel pump thinking that would fix it, but it didnt.
any suggestions?
Gato
05-12-2010, 12:34 PM
#2
Moderator
Join Date: Feb 2009
Location: New Brunswick
Posts: 889
Re: Rough Idle 94 GC 4L 6 cyl
Hey Gato, welcome to the board!
rough idle problems can be caused by a few things, the Idle Air Control Valve being clogged up (its the square blocky bit, with a round sensor on the throttle body) or the Mass Absolute Pressure sensor which is connected with a hose from the intake manifold to the actual sensor on the firewall
my MAP hose got broken when i had cleaned up some leaves under my hood, ended up fixing it with a straw and some electrical tape until i could run out and get some hose.
but these are what you should be looking for, next step would be checking plugs and ignition issues
rough idle problems can be caused by a few things, the Idle Air Control Valve being clogged up (its the square blocky bit, with a round sensor on the throttle body) or the Mass Absolute Pressure sensor which is connected with a hose from the intake manifold to the actual sensor on the firewall
my MAP hose got broken when i had cleaned up some leaves under my hood, ended up fixing it with a straw and some electrical tape until i could run out and get some hose.
but these are what you should be looking for, next step would be checking plugs and ignition issues
05-12-2010, 07:24 PM
#5
Junior Member
Thread Starter
Join Date: Mar 2010
Posts: 15
Re: Rough Idle 94 GC 4L 6 cyl
Couple weeks before that I ran seafoam through the gas tank , starting to wonder if that
kill my fuel pump.
Gato
05-12-2010, 07:25 PM
#7
Junior Member
Thread Starter
Join Date: Mar 2010
Posts: 15
Re: Rough Idle 94 GC 4L 6 cyl
Hey Gato, welcome to the board!
rough idle problems can be caused by a few things, the Idle Air Control Valve being clogged up (its the square blocky bit, with a round sensor on the throttle body) or the Mass Absolute Pressure sensor which is connected with a hose from the intake manifold to the actual sensor on the firewall
my MAP hose got broken when i had cleaned up some leaves under my hood, ended up fixing it with a straw and some electrical tape until i could run out and get some hose.
but these are what you should be looking for, next step would be checking plugs and ignition issues
rough idle problems can be caused by a few things, the Idle Air Control Valve being clogged up (its the square blocky bit, with a round sensor on the throttle body) or the Mass Absolute Pressure sensor which is connected with a hose from the intake manifold to the actual sensor on the firewall
my MAP hose got broken when i had cleaned up some leaves under my hood, ended up fixing it with a straw and some electrical tape until i could run out and get some hose.
but these are what you should be looking for, next step would be checking plugs and ignition issues
Gato
05-13-2010, 08:26 AM
#9
Junior Member
Thread Starter
Join Date: Mar 2010
Posts: 15
Re: Rough Idle 94 GC 4L 6 cyl
When I first heard about seafoam I was the same.
http://www.seafoamsales.com/how-to-use-our-products.html
You can run this through your tank and it'll clean injectors and other stuff.
You can run this through your intake manifold.
Had a friend that had a subaru with a noisy engine, he ran some seafoam through it
and it was quite afterwards.
Stuff is amazing.
Gato
http://www.seafoamsales.com/how-to-use-our-products.html
You can run this through your tank and it'll clean injectors and other stuff.
You can run this through your intake manifold.
Had a friend that had a subaru with a noisy engine, he ran some seafoam through it
and it was quite afterwards.
Stuff is amazing.
Gato
05-13-2010, 02:19 PM
#10
Moderator
Join Date: Feb 2009
Location: New Brunswick
Posts: 889
Re: Rough Idle 94 GC 4L 6 cyl
yeah that stuff is worth its weight in gold i tells ya (and is getting to be about as expensive!)
but its pure petroleum, its not going to mess up your fuel filter, its got the viscosity of gasoline, it basically loosens up the varnish (which could clog the fliter, if it free'd up enough of it!) its good for cleaning the carbon off the valves, free's sticky lifters cleans injectors... i pretty much use this stuff on EVERYTHING, in the oil, in the gas and in the air intake (pour it in from the brake booster hose usually, got the deep creep for spraying in the throttle body)
but id check those sensors, thats what its sounding like to me, or a vacuum line.
but its pure petroleum, its not going to mess up your fuel filter, its got the viscosity of gasoline, it basically loosens up the varnish (which could clog the fliter, if it free'd up enough of it!) its good for cleaning the carbon off the valves, free's sticky lifters cleans injectors... i pretty much use this stuff on EVERYTHING, in the oil, in the gas and in the air intake (pour it in from the brake booster hose usually, got the deep creep for spraying in the throttle body)
but id check those sensors, thats what its sounding like to me, or a vacuum line.