Backfiring in intake
Thread Starter
Heel & Toe
Joined: Jan 2010
Posts: 23
Likes: 0
Backfiring in intake
I got this car running pretty good now but I am having some trouble when its still cold and i put it drive and take off it sputters and backfireds in the intake. After it warms up it runs like a rape date.
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
I see - did you go back with the same poundage rated fuel injectors?
Sure you got the plug wires landed in the correct sequence on the cap?
Check the base timing...should be ~ 6 degree BTC
Normal temp should be over 180 before you really smack the gas.
Check for stored trouble codes there may be some insight there.
Sure you got the plug wires landed in the correct sequence on the cap?
Check the base timing...should be ~ 6 degree BTC
Normal temp should be over 180 before you really smack the gas.
Check for stored trouble codes there may be some insight there.
Thread Starter
Heel & Toe
Joined: Jan 2010
Posts: 23
Likes: 0
Yes I used the same poundage injectors, And I am most positive the plug wires are correct my father was helping me and been a chevy guy forever. I will check the timing but it is only running like crap when cold I am not getting on it just getting out of my development.
Thread Starter
Heel & Toe
Joined: Jan 2010
Posts: 23
Likes: 0
It only does when its cold. like start up and go I am in MD right now and its pretty cold in the morning so I go out and start it 15 min before I go to work and its fine but still would like to have it work like it should
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Drifting
Joined: Jul 2007
Posts: 1,294
Likes: 37
What year vette/engine do you have? On the later vettes with LT1s you have to be certain you match the injector wires connectors to the correct injector.
It is almost impossible for the timing to be off on most Lt1s, unless someone programed your stock ECM.
It is almost impossible for the timing to be off on most Lt1s, unless someone programed your stock ECM.
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
Let's go back to valve adjustment for a second. Run a compression test when the engine is stone cold and post the readings for all 8 lungs. You may have an intake valve misadjusted.....and when it warms up and the oil thins out, the issue goes away.
Have you had any ECM tuning done? If so, what was altered?
Have you had any ECM tuning done? If so, what was altered?
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Where did you get the injectors from?
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
FYI: Their website is way cool they offer flow rates for nearly every injector.http://www.justfuelinjectors.com/ser...flowchart/Page
