Help! My C4 doesn't go.
Thread Starter
Pro
Joined: Dec 2006
Posts: 678
Likes: 0
Help! My C4 doesn't go.
I have a 93. I was driving down the road and suddenly the car was slowing down.
As I step on the gas it doesn't go faster.
Leaving a dead stop I can feather the pedal up to about 20MPH after a long distance.
What is wrong?
Help is appreciated.
As I step on the gas it doesn't go faster.
Leaving a dead stop I can feather the pedal up to about 20MPH after a long distance.
What is wrong?
Help is appreciated.
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
Hard to give a sound diagnosis with the limited info provided but it looks like your post has sat for a few howevers so I'll make a stab at a diagnosis and give you a bump.
I had a cat go bad on my 02 impala and it would run/idle fine but made no power...ie feather throttle and I could nurse it up to speed. So withthe info provided I'd lean towards cats.
With the limited info it could be a lot of things. So I'm shooting in the dark and I'd start with the easy things..look at the engine bay for obvious problems (ie: burned ignition wires, loose connections, discolored fluids etc)....pull codes (sometimes codes are stored without a check engine light....check fuel pressure if it looks good sitting in park....check it under load (tape gauge to windsheild and see what its really doing), check for spark at each cylinder, check catalyt converters,
I had a cat go bad on my 02 impala and it would run/idle fine but made no power...ie feather throttle and I could nurse it up to speed. So withthe info provided I'd lean towards cats.
With the limited info it could be a lot of things. So I'm shooting in the dark and I'd start with the easy things..look at the engine bay for obvious problems (ie: burned ignition wires, loose connections, discolored fluids etc)....pull codes (sometimes codes are stored without a check engine light....check fuel pressure if it looks good sitting in park....check it under load (tape gauge to windsheild and see what its really doing), check for spark at each cylinder, check catalyt converters,
Last edited by aboatguy; Feb 24, 2010 at 07:05 AM.
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
Hard to give a sound diagnosis with the limited info provided but it looks like your post has sat for a few howevers so I'll make a stab at a diagnosis and give you a bump.
I had a cat go bad on my 02 impala and it would run/idle fine but made no power...ie feather throttle and I could nurse it up to speed. So withthe info provided I'd lean towards cats.
With the limited info it could be a lot of things. So I'm shooting in the dark and I'd start with the easy things..look at the engine bay for obvious problems (ie: burned ignition wires, loose connections, discolored fluids etc)....pull codes (sometimes codes are stored without a check engine light....check fuel pressure if it looks good sitting in park....check it under load (tape gauge to windsheild and see what its really doing), check for spark at each cylinder, check catalyt converters,
I had a cat go bad on my 02 impala and it would run/idle fine but made no power...ie feather throttle and I could nurse it up to speed. So withthe info provided I'd lean towards cats.
With the limited info it could be a lot of things. So I'm shooting in the dark and I'd start with the easy things..look at the engine bay for obvious problems (ie: burned ignition wires, loose connections, discolored fluids etc)....pull codes (sometimes codes are stored without a check engine light....check fuel pressure if it looks good sitting in park....check it under load (tape gauge to windsheild and see what its really doing), check for spark at each cylinder, check catalyt converters,
Thread Starter
Pro
Joined: Dec 2006
Posts: 678
Likes: 0
Both computers were rebuilt about a year and a half ago.
Ran perfect since then. Ran perfect when I left the house until I was about 3 miles away. It wasn't gradual, it happened right away. I'll check a few things listed.....Thanks I guess I'll have to take it in.
Ran perfect since then. Ran perfect when I left the house until I was about 3 miles away. It wasn't gradual, it happened right away. I'll check a few things listed.....Thanks I guess I'll have to take it in.
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Drifting
Joined: Dec 2009
Posts: 1,854
Likes: 3
From: Boise Idaho
Both computers were rebuilt about a year and a half ago.
Ran perfect since then. Ran perfect when I left the house until I was about 3 miles away. It wasn't gradual, it happened right away. I'll check a few things listed.....Thanks I guess I'll have to take it in.
Ran perfect since then. Ran perfect when I left the house until I was about 3 miles away. It wasn't gradual, it happened right away. I'll check a few things listed.....Thanks I guess I'll have to take it in.
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
I'll spare everyone my "they need 3 things to run" speech....
Let's get to troubleshooting. Start with the fuel system. Check your fuel pressure at the rail and tell me what you have. Hook up gauge, key on but don't start, tell me the guage reading and how long pressure holds after 2 second prime.
We'll go from there.
Let's get to troubleshooting. Start with the fuel system. Check your fuel pressure at the rail and tell me what you have. Hook up gauge, key on but don't start, tell me the guage reading and how long pressure holds after 2 second prime.
We'll go from there.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
Hard to give a sound diagnosis with the limited info provided but it looks like your post has sat for a few howevers so I'll make a stab at a diagnosis and give you a bump.
I had a cat go bad on my 02 impala and it would run/idle fine but made no power...ie feather throttle and I could nurse it up to speed. So withthe info provided I'd lean towards cats.
With the limited info it could be a lot of things. So I'm shooting in the dark and I'd start with the easy things..look at the engine bay for obvious problems (ie: burned ignition wires, loose connections, discolored fluids etc)....pull codes (sometimes codes are stored without a check engine light....check fuel pressure if it looks good sitting in park....check it under load (tape gauge to windsheild and see what its really doing), check for spark at each cylinder, check catalyt converters,
I had a cat go bad on my 02 impala and it would run/idle fine but made no power...ie feather throttle and I could nurse it up to speed. So withthe info provided I'd lean towards cats.
With the limited info it could be a lot of things. So I'm shooting in the dark and I'd start with the easy things..look at the engine bay for obvious problems (ie: burned ignition wires, loose connections, discolored fluids etc)....pull codes (sometimes codes are stored without a check engine light....check fuel pressure if it looks good sitting in park....check it under load (tape gauge to windsheild and see what its really doing), check for spark at each cylinder, check catalyt converters,
had the same problem .. could be the cat
Le Mans Master
Joined: Dec 2005
Posts: 5,198
Likes: 10
From: Homestead Fl
St. Jude Donor '06-'07-'10-'11-'12-'13-'14
I agree with you but first I look for the obvious and easy then
can you say "flow chart" 
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
for a starting point.Seems like this would be a nice easy solution.
A clogged filer might have good fuel pressure at idle, but have no flow at speed and load. But usually they exhibit symptoms gradually at the higher speeds where flow is greater, like 70 mph.
ICM would likely kill the engine complete and not make it slow down.
Even a melted plug wire is not going to slow down that V8 where you could not get up to 20 mph. Even 2 or 3 melted wires (by coincidence) it will probably keep going but shake a lot.
Knowing the FP would be nice.
I would think cats would be a gradual thing also and not happen suddenly.
I would check the TPS voltage.
Hope it's not the ECM.
IMO – Shot in the dark also.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
My guess is that you have a weak "spark" or a fuel delivery problem...get a fuel pressure gauge and do some checking.
Le Mans Master
Joined: Sep 2009
Posts: 6,937
Likes: 348
From: My interests are mobile
I can't believe the **** flying around in the wind in here. There is NOT enough info to even remotely give even a semi accurate diagnosis.
You have to be MUCH more specific with symptoms, sounds, engine lights, idle quality, and anything else you can think of.
I guess I'll throw in my diagnosis based on the info...maybe all your tires are flat or your foot feels like its pushing but its really not.
EDIT: Didn't see you added some info. Still too vague in my opinion. Your going to have to do some basic troubleshooting like advised above. With something like this START SIMPLE. With no engine lights and the fact the car is running it points to fuel delivery, I'd start there.
You have to be MUCH more specific with symptoms, sounds, engine lights, idle quality, and anything else you can think of.
I guess I'll throw in my diagnosis based on the info...maybe all your tires are flat or your foot feels like its pushing but its really not.
EDIT: Didn't see you added some info. Still too vague in my opinion. Your going to have to do some basic troubleshooting like advised above. With something like this START SIMPLE. With no engine lights and the fact the car is running it points to fuel delivery, I'd start there.
Last edited by RC000E; Feb 24, 2010 at 06:52 PM.
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
I can't believe the **** flying around in the wind in here. There is NOT enough info to even remotely give even a semi accurate diagnosis.
You have to be MUCH more specific with symptoms, sounds, engine lights, idle quality, and anything else you can think of.
I guess I'll throw in my diagnosis based on the info...maybe all your tires are flat or your foot feels like its pushing but its really not.
EDIT: Didn't see you added some info. Still too vague in my opinion. Your going to have to do some basic troubleshooting like advised above. With something like this START SIMPLE. With no engine lights and the fact the car is running it points to fuel delivery, I'd start there.
You have to be MUCH more specific with symptoms, sounds, engine lights, idle quality, and anything else you can think of.
I guess I'll throw in my diagnosis based on the info...maybe all your tires are flat or your foot feels like its pushing but its really not.
EDIT: Didn't see you added some info. Still too vague in my opinion. Your going to have to do some basic troubleshooting like advised above. With something like this START SIMPLE. With no engine lights and the fact the car is running it points to fuel delivery, I'd start there.
I believe aboatguy covered that!
Thread Starter
Pro
Joined: Dec 2006
Posts: 678
Likes: 0
LISTEN RCOOOE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
There is no room for people like you on this forum.
I have a problem with my car, I am asking the kind people of the Forum to help me.
I mentioned the symptoms, I mentioned the NO ENGINE LIGHT among other things.
Its a shame that not all of us use this Forum to help each other out if we can. Go play your computer games somewhere else.
Your opinion is not needed, wanted or will be replied to again, thank-you to those who have put an effort in to helping me.
There is no room for people like you on this forum.
I have a problem with my car, I am asking the kind people of the Forum to help me.
I mentioned the symptoms, I mentioned the NO ENGINE LIGHT among other things.
Its a shame that not all of us use this Forum to help each other out if we can. Go play your computer games somewhere else.
Your opinion is not needed, wanted or will be replied to again, thank-you to those who have put an effort in to helping me.