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Rb26Dett Problem Starting When Warm

BoostedBarge

By BoostedBarge,
in General Maintenance

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BoostedBarge Rising Star

BoostedBarge

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I have a Stagea 260RS with a RB26DETT. It's had a Vipec V44 fitted for 5 years or so now. One thing that has always bugged me and I haven't been able to solve is engine starting when warm. If the engine is cold, it starts straight away. If I shut the engine down and start it 10s later, it starts straight away. If I shut the engine down for a few hours (sometimes up to 8 hours) it always takes a lot of cranking. At first I thought this was a tuning problem and my tuner added more cranking fuel. It may have made a minor difference. A friend and I had another go at it 6 months ago and added more fuel. It seemed to improve the case where you shut down for 10s, but still if the car has been left for a while I have the normal problem. When it does eventually splutter to life, it pumps out a bit of black smoke, so I'd say we've gone too far with the fuelling now. I'm beginning to think this is not an ECU problem, so I was wondering if anyone on this forum might have some ideas of what else I can check. I was thinking it could be an injector that is slowly passing when the engine is off. I had all injectors cleaned and tested when the ECU was fitted, but perhaps they didn't pick or test for this. Any other ideas?

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Ben C34 Grand Master

Ben C34

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I think it would be tune issue. It's hard to set up all of the parameters, and to get it nearly as good as factory is really hard.

I am suprise the cold start is good, usually that's the difficult one to get right.

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GTRPSI Mentor

GTRPSI

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How does is sound while cranking warm, does it sound like the starter struggles a little to turn the motor over, sort of like the battery is losing its balls a little? If so pull some timing out and try again.

Of course if you have a leaking/stuck open injector thats another matter......

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Shoota_77 Veteran

Shoota_77

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As per above I would look at injectors as a possibility. A dribbly injector/s could cause that. Are you running a higher fuel pressure than standard? Could be forcing fuel through the injectors when parked. Does your oil smell really fuelly??

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BoostedBarge Rising Star

BoostedBarge

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Cool. Thanks for the feedback guys. The starter motor never seems to struggle. It cranks quite easily, but just takes a while to eventually start. Fuel pressure is standard. The oil doesn't smell fuelly, but I might check it again.

I'll check out the coolant temp correction, etc.

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Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

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Also if it starts easier with a little throttle applied, I would have a look at the AAC or IACV and give them a test/clean.. there should be some high idle dwell on start up.

I'm not too familiar with your ECU but other ECUs there's an idle dwell which you can adjust which applies a little throttle on startup and dwells a little before dropping to your predefined idle setting.

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BoostedBarge Rising Star

BoostedBarge

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Also if it starts easier with a little throttle applied, I would have a look at the AAC or IACV and give them a test/clean.. there should be some high idle dwell on start up.

I'm not too familiar with your ECU but other ECUs there's an idle dwell which you can adjust which applies a little throttle on startup and dwells a little before dropping to your predefined idle setting.

That's quite a good point about the idle up on startup. I might look into that..

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  • 8 years later...
West Grand Master

West

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On 4/28/2022 at 11:03 AM, BoostedBarge said:

Sadly I sold the car in 2016. I honestly can't remember if I fixed this problem. I don't recall doing the AAC or IACV. Maybe we tuned it out on the Vipec.

Ah ok thanks
I'm having the exact same problem, cold/hot start like a dream, when its mildly warm she struggle and when start, RICH as fk.

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