Won't Idle
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Won't Idle
Just got done installing a custom turbo kit, and am having some serious issues with it not wanting to idle, hot or cold.
Things I've done:
Scaled MAF - voltage looks good. I used a new MAF housing that was identical to the factory size.
Installed larger 840cc P2 injectors in the middle two slots on the big rail (scaled to 1026 in the Cobb)
Installed larger modified 780cc Primary Injectors (scaled to 992 in the Cobb)
Running factory secondaries.
Walbro pump installed per MM instructions
Check for Vacuum leaks everywhere. Nothing found.
It seems like no matter what I do, whether it's add more fuel, increase latency values, or modify the maf scaling, it still stalls. The car acts like it wants to idle but then dies off as it's settling after start up. I'd be happy to provide the map I'm trying to start off with if needed. Maybe I'm missing something very blatant. I may stick in another fuel pump just incase. It just looks to be going lean in all areas. It doesn't respond to anything I change in the Cobb software. Any ideas I may be overlooking?
Things I've done:
Scaled MAF - voltage looks good. I used a new MAF housing that was identical to the factory size.
Installed larger 840cc P2 injectors in the middle two slots on the big rail (scaled to 1026 in the Cobb)
Installed larger modified 780cc Primary Injectors (scaled to 992 in the Cobb)
Running factory secondaries.
Walbro pump installed per MM instructions
Check for Vacuum leaks everywhere. Nothing found.
It seems like no matter what I do, whether it's add more fuel, increase latency values, or modify the maf scaling, it still stalls. The car acts like it wants to idle but then dies off as it's settling after start up. I'd be happy to provide the map I'm trying to start off with if needed. Maybe I'm missing something very blatant. I may stick in another fuel pump just incase. It just looks to be going lean in all areas. It doesn't respond to anything I change in the Cobb software. Any ideas I may be overlooking?
#5
Boosted Kiwi
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I thought you were asking for trouble with those large P1s - that is where I would start . Do you still have the stock reds - they will supply ample fuel in the range you need them to for that turbo .
The other thing is do you have enough drive cycles for the ecu to have adjusted its trims .....
MAF setup and placement looks good to me .
The other thing is do you have enough drive cycles for the ecu to have adjusted its trims .....
MAF setup and placement looks good to me .
Last edited by Brettus; 03-14-2010 at 05:32 PM.
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So put the massive 780cc red's in the secondary position on the big rail, factory 390cc secondary yellows in the primary positions, rescale, alter latency tables. I think I got that correct. I may still have an issue with the large *** secondaries though.
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Gah! Got it to idle this morning. It was rather rich(10's), but it idled. Now it's doing the same thing it was yesterday, again. Won't idle, AFR's are going lean and the car stalls. It's showing no effects to whether I jack up or down latency, adjust the scaling, etc. It almost acts like there is a vacuum leak, but I can't detect anything with the vacuum leak tester.
I stuck the Walbro back in today. I did not drill out the return tube during the original install, however. Maybe this is the problem. Any other suggestions?
I stuck the Walbro back in today. I did not drill out the return tube during the original install, however. Maybe this is the problem. Any other suggestions?
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By jet air do you mean the air pump assembly? If so, I don't have it. It's been deleted.
The OMP vacuum source is in the stock location. I didn't mess with any of that.
#22
Boosted Kiwi
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It idles now, but its very erratic. AFR's are jumping all over the place. Looks like one of the load tables was a bit scewed from stock. Tried playing with the scaling on both the maf and injectors and still idles erratic.
By jet air do you mean the air pump assembly? If so, I don't have it. It's been deleted.
.
By jet air do you mean the air pump assembly? If so, I don't have it. It's been deleted.
.
Jet air is the line that used to be beside the omp vac line - it goes to the jet air tubes in the lower inlet manifold . It provides air to prevent fuel puddling .
Can you log g/s ? If so you could log what your maf looks like at a steady state rpm say 1200 (if you can hold it that low) . Then see if it is bouncing all over the place . If so your maf will need work to straighten the airflow .
Also : do you have a catch can setup for your oil fill neck vac line and where is that piped ?
Last edited by Brettus; 03-15-2010 at 10:00 PM.