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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Oct 12th, 2020, 10:58 | #11 | |
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Oct 19th, 2020, 18:11 | #12 |
Bald
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Is your motor chipped or got an Ostrich?
Could be a bad map or something out of scope on the idle fuel/warm up fuel tables once its reached operating temp, however a redblock will not idle at an AFR of 20, even at 16 you WILL get a lean misfire. Going over the basics may pinpoint the problem, an ARF gauge can highlight a problem so long as the sensor is not at fault which seems likely or as said wrong placement. Lean at idle everything else ok = a vac leak after the MAF would be the next thing I'd be hunting for. |
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Oct 19th, 2020, 18:38 | #13 |
Bald
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After my initial thoughts something else came to mind.
An exhaust leak before the sensor can give a false reading too at idle, while being masked under normal driving. Check your manifold for any leaks or cracks and the turbo to downpipe join. |
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Oct 21st, 2020, 15:14 | #14 |
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Leaning
Hi thanks . I will check . My downpipe definitely has a couple of small leaks .
Spec for enhine as follows. 16t turbo with 3" exhaust Kl racing intercooler. Blue me7 injectors obvs with injector resistor mod Gold ezk with tlao chips Do88 hard pipes |
Oct 21st, 2020, 15:27 | #15 | |
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Also worth noting, if this is the case then at higher rpm the holes will still feed an apparently weaker mixture to the AFR sensor although that error will drop with load and engine speed.
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Oct 22nd, 2020, 20:11 | #16 |
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Thanks
Thanks guys.
I'm glad its just a leak in exhaust gasses now. Easy fix. That resistor thingy was for the headlights And I've since pulled the relay for the auto headlights and now that doesn't get hot anymore . So now I just have side markers on until I turn the headlights on. Perfect! Wonder if its because I'm running led h4s? (Novsight) Either way I'm happy now. 😊 |
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Oct 22nd, 2020, 20:24 | #17 | |
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If you're running good LED H4s, they should only take about 2A per filament unlike their halogen counterparts which would run about 5A, if you have cheap Chinese LEDs, who knows and also they would stand a fair chance of failing the MoT on beam pattern. Good news the lean mix was an easy fix!
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Oct 23rd, 2020, 11:23 | #18 | |
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I'll just butt-in incase it's not solved as this symptom mirrors something I had from years ago ;
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I thought it was the MAF, swapped for one I already had, didn't fix it. Turned out to be the O2 sensor. Bought the right looking one off evilbay for £13, fixed the problem. Funny thing for that particular problem the Lambda light didn't come (most times) on to indicate a problem, the "codes" were useless, it was a mystery. My downpipe was the original at that time, no holes. I cannot imagine having a better turbo and holes in my downpipe!!
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1993 2.0 Turbo SE with 1991 2.0 Turbo engine. Older is better! |
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Oct 23rd, 2020, 12:24 | #19 | |
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Oct 27th, 2020, 20:55 | #20 | |
Bald
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I'm running a similar setup but with a 19T turbo, IPD cam and custom tuning I've done myself using an Ostrich and Tuner Pro RT. All the bins are available on Jetronic Wiki and I've had great fun and a few headaches setting everything up right, these engines are worth the relatively small outlay and are very rewarding to tune. |
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