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So I've been slowly trying to track down my hard start and driveabilty problems with my T/A, I've read a couple different places that the oil from a K&N filter will screw up a MAF sensor, is there any truth to this, anybody have any experience with this? Was Bosch original equipment on these cars? I've been thinking about ditching the K&N and picking up a new Delphi because if the Bosch is original it's probaly original and shot. I've got a bunch of other things I need to check as well but figured I'd ask about the MAF since it probably needs done anyway.
Bosch was original equipment, I run the Delphi and have no issues and even have a K&N filter on my GTA. I tried another brand of MAF before that, called silver streak IIRC, and the car ran terrible and threw a code.
You could also try cleaning the Bosch with MAF cleaner but it’s probly just shot, mine would get heat soaked and cause hot start up issues but really only acted up when warm typically.
MAF cleaner spray works but you need to use it regularly with a hot wire MAF and an oiled air filter. In my experience, the Bosch MAF's are hands down the best MAF's for our cars. Other, newer technologies, that are sold as stock replacements, are not nearly as good. They are inaccurate and comparatively (and noticeably) much slower to respond to air flow changes than the Bosch hot wire units. I also learned that the Bosch units are individually calibrated at the factory for accuracy. Apparently we can send them in for repair, but I have not looked into this.
Bosch was original equipment, I run the Delphi and have no issues and even have a K&N filter on my GTA. I tried another brand of MAF before that, called silver streak IIRC, and the car ran terrible and threw a code.
You could also try cleaning the Bosch with MAF cleaner but it’s probly just shot, mine would get heat soaked and cause hot start up issues but really only acted up when warm typically.
It's probably shot then, I doubt that it's my problem but probably should be changed out anyway, I'm still waiting on my fuel pressure gauge to do further trouble shooting, also need to check for vacuum leaks too. Where did you get your Delphi?
MAF cleaner spray works but you need to use it regularly with a hot wire MAF and an oiled air filter. In my experience, the Bosch MAF's are hands down the best MAF's for our cars. Other, newer technologies, that are sold as stock replacements, are not nearly as good. They are inaccurate and comparatively (and noticeably) much slower to respond to air flow changes than the Bosch hot wire units. I also learned that the Bosch units are individually calibrated at the factory for accuracy. Apparently we can send them in for repair, but I have not looked into this.
I cleaned my sensor with CRC MAF cleaner just the other day and noticed no difference, I don't think that's the problem anyway, I think I have a vacuum leak or fuel related problem, fpr or injectors, maybe even the pump, won't know that til my gauge comes and can do the tests.
It's probably shot then, I doubt that it's my problem but probably should be changed out anyway, I'm still waiting on my fuel pressure gauge to do further trouble shooting, also need to check for vacuum leaks too. Where did you get your Delphi?
Rockauto is where I got mine, pretty good price and fast shipping.
I cleaned my sensor with CRC MAF cleaner just the other day and noticed no difference, I don't think that's the problem anyway, I think I have a vacuum leak or fuel related problem, fpr or injectors, maybe even the pump, won't know that til my gauge comes and can do the tests.
Do you smell fuel in that small vacuum line that goes to the FPR? If the FPR and injectors are original it’s not a bad idea to replace both and be done with it. Delphi makes a quality drop in injector and I run the Bosch 3s which have worked well for me but can require tuning, I added an Adj. fuel pressure regulator when I replaced all that.
Rockauto is where I got mine, pretty good price and fast shipping.
Thank you I'll check it out
Originally Posted by Reddragon88gta
Do you smell fuel in that small vacuum line that goes to the FPR? If the FPR and injectors are original it’s not a bad idea to replace both and be done with it. Delphi makes a quality drop in injector and I run the Bosch 3s which have worked well for me but can require tuning, I added an Adj. fuel pressure regulator when I replaced all that.
I pulled that hose the other day and did not smell fuel, I vaguely remember previous owner saying about changing the injectors but can't remember for sure, my fuel pressure gauge should be here tomorrow so I can get back to it on Saturday. I'm really leaning towards vacuum leak to be honest, the way it idles sometimes acts just like a vacuum leak. I have to rig a propane hose this weekend too and see if I find a leak. I'm going to check the base timing too, I believe base timing should be 6 degrees advanced, anyone know if that sounds right? Another thing I noticed that makes me think a vacuum leak is it's always idled too fast, I set the idle the other day without the IAC connected as directed and that throttle screw was way out, it still idles high but not as bad but now it sometimes stalls in gear, which makes me think the previous owner or owners had it cranked up to compensate for the vacuum leak.
So my MAF sensor was the culprit of the hard start condition, installed a new Delphi unit today and car fires right up, still not not 100% but waaaaay better than it was, gotta keep going over things to get it 100%, checking baseline timing next this weekend. Idle is still wonky and still has a slight hesitation but way better than it was. Headed in the right direction at least, finally.
, thanks for the tip! 
, I'm slowly chipping away at it. 