My car takes about 5-7 sec of cranking to fire up and after i start the car when i hanvent driven it for a few hours i cant get it far past three rpms without the car warming up for a few min. It has been getting worse and i have been suspecting fuel injectors, am i suspecting right?
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mine does the same and lately I've heard a ticking noise under the hood. Upon closer inspection the noise sounds as if it's coming from the injectors. planning to change mine next week -
well i am going to throw in some new injectors on monday and see, any other things i should check?Comment
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fuel pump/filter? when was the last time filter was changed?Comment
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We have an 89 325is and it does the same thing. Lots of others with ~high mileage e30's experience much the same. One good thing is that there may be a good fix for all this.
On my end, I spent mucho dollars with a knowledgeable German mechanic to diagnose the ongoing problem. Some of the vast monies spent was my decision to throw money at it knowing that I am into a restoration/repair of this vehicle by replacling various components. The only things left are to R&R the head, replace the alternator and replace the injectors.
Believe me, we did every known test to remedy the dilema. All components checked out well under bench tests and backed up with the scope to read impulses and whatnot.
My injectors were pulled along with the rail. Checked for spray pattern and leakage. Nothing. The seals were cracked and dry. Replacing them changed nothing.
I am of the opinion that a valve job is in order. All aluminum heads need periodic dressing of the seats as they tend to wafer. This leads to a lack of compression during the low starting rpm. I know, I know. We all do a compression check and all is well. But let's remember that static compression vs dynamic compression are two different things. To back up my theroy, think about what happens during long cranking periods oftime. All that is really happening is that we are building head pressure until it finally fires. Longshot, yes, but this is my story and I'm sticking to it.
I am in the process of aquiring parts to do a complete rebuild of the "i" engine. I'm jonesing to see how the head is worn or not.
Sorry for the winded post. I hope changing the injectors in our high mileage engines is the answer. I know in the end, my anality won't let me rest until the engine is rebuilt and the injectors are new. Woe is me if it turns out the alternator is worn to the point that during cranking a (short) of some type, due to dirty commutator or something prevent full voltage to the ECU. But that's the other side ofthe coin.
Regards. RegisComment
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Well i just changed the rail and the injectors in my car. When i pulled the fuel lines off there was no fuel that came out of the hoses. I read that there was to be a decent amount of gas that would come out, could this be somthing to do with the problems i am having? i havent ran my car yet because even though there wasnt any gas out of the lines there was gas in the rail that is everywhere so i am letting that dry up. thoughts...?Comment
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The way I understand it (correct me someone if I am wrong) is that the fpr above the fuel injector rail, and the "rear" fpr (which I have heard mentioned, but haven't seen, maybe something in with the pump assembly?) should keep the lines under pressure constantly running or not. Now, if one or both is failing, then the gas will tend to bleed back toward the tank, thus creating a longer starting time by forcing the fuel pump to repump that gas back to the fpr and on to the injectors.Originally posted by rede30
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Sounds like an in-line gauge might be needed to collect some info as to how the lines are or are not holding pressure. I also read that residual pressure is ~35 lbs. I'd like one even though I was assured all is well.
On the other hand, in my case, after long crank times, the smell of fuel is heavy. Dunno.
I don't have any further hands on knowledge of this. Can't further contribute. Not that I did, but...Comment
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well i put in a new fpr,the one on the rail, and i will hope that the issue.Comment
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I fixed the start up issue but now after puting in a new fuel rail, injectors and wire harness for the injectors my car runs rough, very rough its hard to get it up to speed. It does idles perfect, whats going on? Everything i just put on this car was used from a motor i pulled a few months ago and then it ran very good. I realize the injectors probably could have gotten messed up sitting so do you guys think the injectors are dirty from sitting?Last edited by rede30; 06-20-2006, 03:13 PM.Comment
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Replace your fuel filter. If that doesn't help, check the pump.Comment
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