In reply to Pete. (l33t FS) :
That may be a good idea, though I think I'm having two separate issues. The miss is causing it to shake at low rpm, but I don't think it would cause the bucking and stalling issue which is very intermittent and only happens when it's good and hot. The stalling is the big driveability issue. I wish it would throw codes in any case. Then I'd have something to go off of.
No codes suggests that it's something simple like a fuel pump or a relay failing. Of course, to diagnose it, you have to get it to act up, and problems love to hide when test equipment is out.
In reply to Pete. (l33t FS) :
Add to that I don't have any real diagnostic equipment and I'm not going to pay anyone and you see my dilemma.
It's too nice a car to junk, but it's not worth anything and I can't afford to just throw parts at it. I've been driving it for a week and I really like it though. Might try unplugging the maf and see what happens. It's acting like a TPS, but I need to find the proper testing procedure first.
There is a fuel pump controller that I bypassed (resulting in the pump running at full chat all the time) and it made no difference, though I can't actually hear the pump while driving. I need to get a gauge.
Someone check my thinking
The Indy my parents took the car to said he checked compression and swapped coils around and his scanner still showed #8 misfiring. Said it had also thrown a knock code.
My theory is that #8 injector is bad/leaking. The computer sees a rich condition on that bank and leans it out. The other cylinders go lean, and detonate producing that knock code. Meanwhile, the funky fueling in the bank causes the engine to shake and occasionally stall. As always, at the first sign of trouble I put my foot down and then everything is fine since the theorized leaking injector is flowing much closer to its siblings under WOT conditions.
The engine uses the old style fatty injectors that I cannot bench test. Looks like this:
I know little about EFI, and do not know if this car uses batch fire injection or sequential.
Rock auto has reman injectors for reasonable money, and I'm hesitant to try and move the suspect injector around to see if the problem follows. The mechanic said his scanner showed #8 missing and the plug was slightly fouled. That's all I have to go on. No codes. And I don't suspect fuel pressure since flooring it results in going fast and everything smooths out.
Also, knowing this board, anyone have an injector/set of injectors they don't need for a Q45?
In reply to barefootskater :
Theory sounds good. If I have time at the junkyard Monday I'll see if I can grab you an injector.
Well maybe not. I was assuming normal Nissan lego interchange but those injectors only came on 1st get Q45. Maybe swap your injectors around to confirm the problem moves with it?
In reply to Stampie (FS) :
That would be awesome, under two conditions.
1) do not make a special trip on my account.
2) do not feel obligated
Just saw your second reply. Yeah I'd heard these cars didn't share much with any other models. I'll just gamble on one from Rock Auto.
Another two weeks of driving with no attempt to fix anything. It's steadily been getting worse, lately not even waiting to warm up before stalling and bucking. Yesterday it illuminated the engine light so I checked it today, p0325, knock sensor. This is three times in 9 months. Cleared the code and drove home. It ran much better than it has in a week. The other point of interest is stomping the throttle no longer fixes the bucking issue.
Everything is still telling me this is a fuel issue, and I really should pull the pump just to make sure the screen isn't damaged and blocking the pump, as that would be a silly thing to overlook. I still suspect an injector, as I did notice black fuel smoke on startup the other day. In fast, regular puffs. Like one or two cylinders is very rich. Once the mustang sells I'll have some dollars to play with.
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