Engine Cold Starts

crulejaypee · 2007年12月13日

Cold Starts

I'm having cold start issues since I installed the turbo system to my 01 corolla. The rmp is not steady, but jumps around until the engine get hot. It will stall at times in the morning. One theory is the 380cc fuel injectors installed. We are thinking of replacing them with the stock and use supplementary large injectors to supply enough fuel to the turbo engine. The engine was also rebuilt, but the cold start problem was prior to the rebuilt. Does anyone know what is causing the cold starts problem?

Dreadon · 2007年12月13日

how old is ur battery and when was the last time it was changed also did u reuse the same alternator when u rebuilt ur engine it could be either one if it is having a hard time idling it could be bad one or on its way out.

crulejaypee · 2007年12月14日

Dreadon</strong> said:

how old is ur battery and when was the last time it was changed also did u reuse the same alternator when u rebuilt ur engine it could be either one if it is having a hard time idling it could be bad one or on its way out.</div>

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</div>The battery was checked and its ok. The alternator is new.

DrunkSaru · 2007年12月14日

how much does it jump around?

GSE21tuner · 2007年12月17日

crulejaypee</strong> said:

It start at 1500 rpm, then it drops between 400 rpm and 900 rpm. If I don't give it some gas, it will stall. Once the engine is warm, it will stay at 900 rpm. We beleive it's the bigger fuel injectors because the factory ECU has control of it and it's programmed to see 260cc instead of 380cc.</div>

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</div>Have you checked the plugs? I had that same problem.

crulejaypee · 2007年12月17日

rollatuner110</strong> said:

Have you checked the plugs? I had that same problem.</div>

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</div>You mean checking for the proper gapping of the spark plugs?

crulejaypee · 2007年12月17日

DrunkSaru</strong> said:

how much does it jump around?</div>

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</div>It start at 1500 rpm, then it drops between 400 rpm and 900 rpm. If I don't give it some gas, it will stall. Once the engine is warm, it will stay at 900 rpm. We beleive it's the bigger fuel injectors because the factory ECU has control of it and it's programmed to see 260cc instead of 380cc.

crulejaypee · 2007年12月17日

rollatuner110</strong> said:

Well that too, but check to see if the plugs are still good. I had a semi-functional plug that stalled at start but then ran fine at higher speeds. It was really strange indeed.</div>

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</div>The plugs are new after the rebuild. This is the second time we changed the plugs. Do you think is a gapping problem and if so, what would be the proper gapping?

GSE21tuner · 2007年12月17日

Well that too, but check to see if the plugs are still good. I had a semi-functional plug that stalled at start but then ran fine at higher speeds. It was really strange indeed.

DrunkSaru · 2007年12月17日

if gapping was the problem wouldn't the engine jump around even after its warmed up? i'm thinking more of clogged injectors maybe?

crulejaypee · 2007年12月18日

DrunkSaru</strong> said:

if gapping was the problem wouldn't the engine jump around even after its warmed up? i'm thinking more of clogged injectors maybe?</div>

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</div>If that is the case, why would it steady itself after the engine is hot?

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