Post by
desertq45 »
https://forums.nicoclub.com/desertq45-u12808.html
Sat May 12, 2007 7:53 am
Hey Guys,
I've been slowly working through my problem with little change. The current symptoms are more pronounced and easier to replicate. Quick accelerator pedal movement (attempted hard acceleration) results in the engine cutting out... it stays running most of the time but almost stalls. Some times check engine light comes on.
Repeated effort results in complete stall and the check engine light always comes on. Occasionally, the Q will accelerate like you would expect until the top end and then cut in and out... immediate decelleration results in normal drivability. In fact if you gingerly apply the throttle, it will not exhibit the described symptoms (although it is absolutely no fun to drive it that way).
What I've done (in chronological order):
- Replaced Fuel pump with new from IofS.- New Fuel filter.- Switched to a known good FPCU w/new pump... no change... opened case of original, no burn marks... put original back in.
No change in symptoms.
Replaced all underplenum hoses, etc.Cleaned IAC, plenum, TB, EGR, etc.Replaced KS w/new.Cleaned MAF per Q45.org and did the harness "wiggle test" as well as cleaning the contacts until shiney and adding dielectric grease. Checked harness wiring and still very fexible down to the loom on the ornamental cover.
After this, Q started right up, idled smoothly, but... same wot problem. Severity of cut out and stall is random... but normally on hard acceleration. Basically, status quo.
I read hours worth of posts on MAF and then purchased a used one for $80 to see if it made any difference. Installed it, no perceived changes. I opened the top of my original MAF to check the solder connections. They looked fine, but I resoldered them anyway. Ran continuity tests across the races (not sure it why) and it was good from the connector all the way through.
I once again cleaned the harness connections and reassembled.
No change.
So... today I ohmed the injectors. I live in Phx and every mechanic I know tells me the gas kills Q injectors. I found that all injectors ohm between 12 and 14, but number 3 is 17 and 7 is 20. Would this be enough to cause my problem?
I've also recall someone here mentioning that they went through 2 MAFs before finding one that really worked. Are these things that volitile? I just didn't want to drop $400 on an experiment for a new one from Joe, but if it is the likely problem it would be worth it to put an end to this pain.
Any thoughts or pointers would be very welcome here... I think I've ruled out fuel delivery other than possibly the two out of range injectors. I'm also wondering about spark plugs?? It's been 40k since last change.
Any ideas?
Thanks