It has been since mid January since i got the car to be running properly.
I say properly, because since the first day i got it, i know it has vacuum leak(s) and various other small issues.
Even the valves were incorrectly adjusted, which masks the sound and performance of the engine.
Saturday i finally replaced the fuel pump, which turned out to be the cause of my start, fire and dies issue despite almost instant 3 bar pressure at the rail.
Basically, everything except the AFM and the O2 heater relay have been replaced, injectors included. I feel, that there is a tiny misfire.
Today i pulled the plugs, Bosch W8 ones and they are bone dry (no oil anywhere) and a very nice relief to see brown/tan colour on all of them, yes gapped to 0.7mm (0.8mm feeler gauge does not fit)
As of Saturday, the entire ignition system, fuel system and cooling system have been refreshed (cap, rotor, coil, pump, radiator, CPS sensor, wires w/sensor, belts, tps etc). So i never actually heard this engine run well before, and this maybe in my head.
There are no idle issues cold or warm, no start up issues (warm or cold), no acceleration/off throttle issues whatsoever. The engine is super smooth when driving, be it cruising, 1/2 throttle or WOT.
The coil was the only thing i tested that read stranger resistances. I saw 0.8 ohms between terminals 1 and 15 as well as 6,750 between 15 and center. Which is indeed high but it is a new coil, is this normal?
Testing the fuel system, i checked the flow and recoded 1,100ml in 30 seconds (brand new pump) instead of the 875ml in the manual.
I vacuum tested via a cold start cleaner all over the intake manifold, injectors, TB, AFM, boot etc. No issues found, so i did a quick smoke test, by blowing smoke into the intake via the vacuum lines for the FPS. I had someone in the shop check with a flashlight, we both could not find any smoke escaping. Only when i applied compressed air into that vacuum line, smoke started to come out of the air filter box (some smoke, not all of it).
So i take it that there are no vacuum leaks, even checked the DME pins and verified what the sensors have, everything is spot on including grounds.
Could that slightly higher resistance coil or slighter more flowing fuel pump be the cause of this slight (very slight) misfire? or is it in my head?
As i said, there are no issues at all, when driving or starting the car. Just idle sounds like...well an old BMW
but maybe with carbs instead of injectors? i watched several "misfire" videos on youtube, mine sounds nothing like what is online.
I do have the old coil, the original one from 1990, i need to test the specs but i think i replaced the coil just for insurance so it does not fail when travelling across germany or something.
I say properly, because since the first day i got it, i know it has vacuum leak(s) and various other small issues.
Even the valves were incorrectly adjusted, which masks the sound and performance of the engine.
Saturday i finally replaced the fuel pump, which turned out to be the cause of my start, fire and dies issue despite almost instant 3 bar pressure at the rail.
Basically, everything except the AFM and the O2 heater relay have been replaced, injectors included. I feel, that there is a tiny misfire.
Today i pulled the plugs, Bosch W8 ones and they are bone dry (no oil anywhere) and a very nice relief to see brown/tan colour on all of them, yes gapped to 0.7mm (0.8mm feeler gauge does not fit)
As of Saturday, the entire ignition system, fuel system and cooling system have been refreshed (cap, rotor, coil, pump, radiator, CPS sensor, wires w/sensor, belts, tps etc). So i never actually heard this engine run well before, and this maybe in my head.
There are no idle issues cold or warm, no start up issues (warm or cold), no acceleration/off throttle issues whatsoever. The engine is super smooth when driving, be it cruising, 1/2 throttle or WOT.
The coil was the only thing i tested that read stranger resistances. I saw 0.8 ohms between terminals 1 and 15 as well as 6,750 between 15 and center. Which is indeed high but it is a new coil, is this normal?
Testing the fuel system, i checked the flow and recoded 1,100ml in 30 seconds (brand new pump) instead of the 875ml in the manual.
I vacuum tested via a cold start cleaner all over the intake manifold, injectors, TB, AFM, boot etc. No issues found, so i did a quick smoke test, by blowing smoke into the intake via the vacuum lines for the FPS. I had someone in the shop check with a flashlight, we both could not find any smoke escaping. Only when i applied compressed air into that vacuum line, smoke started to come out of the air filter box (some smoke, not all of it).
So i take it that there are no vacuum leaks, even checked the DME pins and verified what the sensors have, everything is spot on including grounds.
Could that slightly higher resistance coil or slighter more flowing fuel pump be the cause of this slight (very slight) misfire? or is it in my head?
As i said, there are no issues at all, when driving or starting the car. Just idle sounds like...well an old BMW
but maybe with carbs instead of injectors? i watched several "misfire" videos on youtube, mine sounds nothing like what is online.
I do have the old coil, the original one from 1990, i need to test the specs but i think i replaced the coil just for insurance so it does not fail when travelling across germany or something.
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