Chugging at WOT?
Thread Starter
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Joined: Aug 2002
Posts: 527
From: Orlando, FL
Chugging at WOT?
I was racing around town with a Porsche turbo the other night and notice my car was acting strange. First off I will explain what kind of driving the Porsche and me were doing. It was your basic zip around traffic and hit the throttle when ever the traffic was clear. Well about the third time that we cleared some traffic and let the cars loose, it felt like my car wanted to stall out at WOT. It would go up through the rpms but it would chug a few times and cause a jerking motion. Then when I would reach a light and was at idle, the rpms would jump around. It wasn’t surging, it would stay at 800rpms then about 10secs later would jump to 1300rpms to 1000rpms to 1300rpms back to 800rpms. It would stay at 800rpms for a few seconds and repeat the same thing. As I would accelerate, the car would chug again when I was reaching 3000rpms. I drove the car home and let sit for the night. The next day I start the car up and everything is fine. I drove around town and no chugging, so then I hit the throttle. At WOT the car was running perfect, no chugging either. I’m just curious at what could cause the car to just acted strange the night I was racing around? It felt like a misfire or the timing just all of sudden was off. Any explanation on what was going on?
Thread Starter
Registered User
Joined: Aug 2002
Posts: 527
From: Orlando, FL
Well, the problem happened again yesterday. After hitting the throttle and letting it idle, twice, the chugging and weird idle problems came back. The problem only seems to occur after I’m at WOT a few times in like 15 min time frame. The car is also backfiring. Any ideas to were to start diagnosing?
Last edited by jdizzell; Mar 10, 2004 at 06:49 PM.
Thread Starter
Registered User
Joined: Aug 2002
Posts: 527
From: Orlando, FL
LOL!!
I know I’m the only one responding to my own post, but I found out some more info on my little problem. Today I wanted to test if the cars temperature had any effect on whether the car would chug at WOT. Well it seems that it does. When the car is about 180 degrees(¼ up on the temp gauge) and I floor it, the car runs perfect !!! I have missed that power for awhile now
. When the temperature gauge gets to half way or above, I think it is like 200-220 degrees, and floor it the same old problem occurs. So if anyone has ANY SUGGESTIONS I would love to hear them!!!
I know I’m the only one responding to my own post, but I found out some more info on my little problem. Today I wanted to test if the cars temperature had any effect on whether the car would chug at WOT. Well it seems that it does. When the car is about 180 degrees(¼ up on the temp gauge) and I floor it, the car runs perfect !!! I have missed that power for awhile now
. When the temperature gauge gets to half way or above, I think it is like 200-220 degrees, and floor it the same old problem occurs. So if anyone has ANY SUGGESTIONS I would love to hear them!!!
Registered User
Joined: Nov 2003
Posts: 1,770
From: Mishawaka, IN
opticrap???
chugging and backfiring are usually ignition problems, anyway, I won't say it's the opti for sure...
The heat related thing sure sounds suspicious though, when my opti went I started it cold, ran fine for 5 minutes, then started crapping out again...
chugging and backfiring are usually ignition problems, anyway, I won't say it's the opti for sure...
The heat related thing sure sounds suspicious though, when my opti went I started it cold, ran fine for 5 minutes, then started crapping out again...
Thread Starter
Registered User
Joined: Aug 2002
Posts: 527
From: Orlando, FL
UPDATE!!!! Today I drove the car for about a half hour, and the temp gauge was at half way, the car starts stuttering and violately chugging again. Its there from idle to acceleration and all the way through the rpm range. I then drove the car on a long stretch of road to cool the engine down. Even though the engine did cool down to about 180, the stuttering was still there. There is also a tremendous amount of backfiring and popping from the exhaust. I have spring break coming up and will spend that time diagnosing the car. I do have some ideas on what is causing it, but I would like some feedback from some experience LT1 pro’s. Any suggestions on were to start and what the hell is going on will DEFINETLY BE APPERRICATED!!!!!
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Joined: Jul 2002
Posts: 676
From: Winter Springs, FL
Sounds like the problem I had. When the temp was cool, it would only sputter up hight. But once it got half way and above, it would sputter and miss when I gave it gas. Turned out to be the opti. I also went ahead and changed the coil and put an MSD coil.
Do everythign at once if possible. Opti and plugs/wires, but Opti seems to be your main prob.
Do everythign at once if possible. Opti and plugs/wires, but Opti seems to be your main prob.
Thread Starter
Registered User
Joined: Aug 2002
Posts: 527
From: Orlando, FL
Also, I know it will be more time consuming, but I plan to just do one thing at a time and post back the results. This way if anyone else has the same problem, they can follow along the steps that I took
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Joined: Mar 2004
Posts: 82
Your opti is going bad and eventually it wont start at all. The car when cold runs like a scauled dog and it feels it's fastest am i correct?
Once the car warms up it has a chug or miss after a certain temp. It is 100% opti problem. GL
Once the car warms up it has a chug or miss after a certain temp. It is 100% opti problem. GL
Registered User
Joined: Mar 2004
Posts: 82
Originally posted by 30thZ286speed
My car is doing the same exact thing, I think its my opti but I am not for sure. From the PCM I am getting a code 300 misfire and codes for both cylinder banks running too rich.
My car is doing the same exact thing, I think its my opti but I am not for sure. From the PCM I am getting a code 300 misfire and codes for both cylinder banks running too rich.