12-21-2020, 03:32 PM | #1 |
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Engine Stalling every cold start
https://vimeo.com/493476826
The roughest cold start I've ever seen. Video doesn't do it justice. The RPMs fluctuate by 5-600 rpms up to 1200 then drop back down to 600 continuously over and over until the engine stalls. 0 codes on the car but I've been getting around 6-8mpg and my cold start will always stall the car unless its being driven right away or revved. Its been getting worse with colder climate, but completely disappears after 1-2minutes of driving. Performed a Smooth Running Test on ISTA+ and it showed all 8 injectors as within range hence the no codes. The issue seemed to start after I removed the cold start since i no longer have catted downpipes. Current mods are: Catless downpipes Full 3in IPE exhaust VRSF Intercoolers methanol injection without Jb4 map0 gapped ngk plugs DME stage 2 tune bcm with jb4 upgraded SSP clutches afe cold air intakes stage 1 turbos Cold start delete Probably something Im missing but nothing out of the ordinary. |
12-21-2020, 09:25 PM | #3 |
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I will to try temporarily and see if this remedies the issue. My next door neighbor and friend of many years politely asked if I could lower the exhaust sound as I work on call and my schedule is 24/7 mostly in the early am hours.
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12-21-2020, 09:31 PM | #4 |
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https://vimeo.com/493590712
Updated video of the car actually stalling this was 2 hours ago. |
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12-22-2020, 02:18 AM | #5 | |
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I would contact DME and tell them the issue. Who knows, maybe you got a corrupt file? If not, flash back to stock then tune again with the cold start delete enabled at the same time as flashing the tune. Otherwise, I would try a different tune. See if you can explain to a different company that the engine is stalling with a DME cold start delete and would like to get their reassurance that it won't happen if you switch. |
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12-22-2020, 10:54 AM | #6 | |
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12-22-2020, 01:22 PM | #7 |
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Could it be faulty o2 sensors? Did one get dinged up during the downpipe install? I know when I installed my downpipes recently, I had to order a special o2 removal socket tool to not mess up the wires during removal. Although I would imagine that would throw some kind of code.
I would have also started with the injectors, as that's typical symptom of a leaky fuel injector that eventually burns off after start up and runs okay afterwards. Perhaps it's just on the way out and not throwing a code yet and the cold start delete is just exacerbating the issue. |
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12-22-2020, 02:43 PM | #8 | |
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03-04-2021, 10:40 PM | #10 | |||
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Found out my smaller axillary coolant tank was slowly leaking, always seems empty. Turbo coolant lines were clean. My stock plastic intercoolers had a crack and was leaking coolant into the engine. Replaced them both with VRSF Charge Coolers and my problem is solved. Also the AFE Cold Air Intakes were throwing off my fuel trim causing a 6-7miles per gallon. Reverted those back to stock with charcoal filter delete and my problems are solved! |
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