Missing at low rpm
09-01-2005, 08:25 PM
#1
2nd Gear Member
Thread Starter
Join Date: Mar 2005
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Posts: 204
Missing at low rpm
After installing my new 306 it has a slight miss at idle and up to about 2300rpm. I dont have a msd 6al yet, and everything else is new. When I stomp on it the miss goes away. I am running a stock fuel pump and 24's I have my fuel pressure set at 40 and my timing at 14 base. Do you guys think I need a better ignition or is there something else going on?
09-04-2005, 06:45 AM
#4
2nd Gear Member
Join Date: Jun 2003
Location: United States
Posts: 498
RE: Missing at low rpm
I had a very similar problem, so a buddy of mine took my car out, threw it in 5th gear, then stepped on the gas. It was miss-firing badly, and it was only noticeable at low RPMs, so he figured it was a rocker arm, and sure enough, he was right. If you have one of those infrared guns that checks the tempurature of a given part, shoot the primaries from your headers, if one of them is cool, pop your valve cover and check your rockers.
09-04-2005, 12:22 PM
#5
5th Gear Member
Join Date: Jul 2003
Location: United States
Posts: 3,451
RE: Missing at low rpm
ORIGINAL: tchamber
I had a very similar problem, so a buddy of mine took my car out, threw it in 5th gear, then stepped on the gas. It was miss-firing badly, and it was only noticeable at low RPMs, so he figured it was a rocker arm, and sure enough, he was right. If you have one of those infrared guns that checks the tempurature of a given part, shoot the primaries from your headers, if one of them is cool, pop your valve cover and check your rockers.
I had a very similar problem, so a buddy of mine took my car out, threw it in 5th gear, then stepped on the gas. It was miss-firing badly, and it was only noticeable at low RPMs, so he figured it was a rocker arm, and sure enough, he was right. If you have one of those infrared guns that checks the tempurature of a given part, shoot the primaries from your headers, if one of them is cool, pop your valve cover and check your rockers.
09-06-2005, 12:39 AM
#7
Sith Lord/Site Mod
Join Date: Jan 2005
Location: IA
Posts: 5,036
RE: Missing at low rpm
Since the install I did a compression test, but I havent checked the rockers. I will check that tomorrow.
reset the tps voltage, should be as close to 1v without going over, like .995-.999
09-06-2005, 11:15 PM
#9
2nd Gear Member
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Join Date: Mar 2005
Location:
Posts: 204
RE: Missing at low rpm
I redid the rockers and they were right. I was showing my car on friday I dont have a vacumm line going to my egr or my fuel pressure regulator. They were both plugged off. I was told thats my problem. I am supposed to run it at the strip Saturday so I will try that next. I also have really bad fumes comin from the pipes.....it will make your eyes water. I am going to fix the vacumm lines, install a new fuel filter, and I just purchased a big shot 150-300 wet kit. I need to get this car tuned before I put the nos on. One last question... how do you reset your computer? Disconnect the battery?
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