low-mid rpm stumble/studder..
05-02-2007, 02:19 PM
#1
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Join Date: Nov 2001
Location: Houston, TX USA
Posts: 86
low-mid rpm stumble/studder..
I have a low to mid range RPM studder or stumble that sounds like a miss, and you can feel a vibration in the car.. it sounds & acts like a miss.
I have full power under full throttle, it only occurs between 1500-3500 RPM range.
I just replaced ICM, Coil, Plugs, Wires, and Opti.
The issue predates the replacement of the parts listed above.
Could an injector cuase what I am seeing? I am not getting any codes.
It is a PCM for less tune on the OBDII PCM, however I can feel the same behavior on an older MTI OBD1 PCM.
I am pulling my hair out with this one. Any suggestions or ideas appreciated.
Adam
I have full power under full throttle, it only occurs between 1500-3500 RPM range.
I just replaced ICM, Coil, Plugs, Wires, and Opti.
The issue predates the replacement of the parts listed above.
Could an injector cuase what I am seeing? I am not getting any codes.
It is a PCM for less tune on the OBDII PCM, however I can feel the same behavior on an older MTI OBD1 PCM.
I am pulling my hair out with this one. Any suggestions or ideas appreciated.
Adam
05-05-2007, 06:46 PM
#4
Registered User
Join Date: May 2007
Posts: 3
stumble....
Hey Guggi97_RA,
I have a 94 Z-28 and my car started the same thing, initially was clogged injectors in 3 or 4 cylinders. I had them cleaned and it went away but only for a 2 or 3 weeks. I finally replaced the injectors but now, from running it so long with the clogged ones alot of other crap went wrong. I am still trying to figure out the issues with mine. But in response to your thoughts, I agree with the injectors. This may not be the only problem, may not even be THE problem but is a safe start and having them pulled and cleaned should only run around $150 give or take. A Hanes manual gives some possible problems in their trouble shooting section. And the injectors are not too bad to replace. You WILL need the fuel line disconnect tool though if you want to totally pull the fuel rails. Mainly that seems to be needed for replacing the fuel pressure regulator. I'm no pro like some of these fellas, some of these posts are way beyond me, that is why I love this site, wild info!
I have a 94 Z-28 and my car started the same thing, initially was clogged injectors in 3 or 4 cylinders. I had them cleaned and it went away but only for a 2 or 3 weeks. I finally replaced the injectors but now, from running it so long with the clogged ones alot of other crap went wrong. I am still trying to figure out the issues with mine. But in response to your thoughts, I agree with the injectors. This may not be the only problem, may not even be THE problem but is a safe start and having them pulled and cleaned should only run around $150 give or take. A Hanes manual gives some possible problems in their trouble shooting section. And the injectors are not too bad to replace. You WILL need the fuel line disconnect tool though if you want to totally pull the fuel rails. Mainly that seems to be needed for replacing the fuel pressure regulator. I'm no pro like some of these fellas, some of these posts are way beyond me, that is why I love this site, wild info!
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