ysteve

Guys i wanna ask is somebody had a problems with MAF sensor, and how you check that, and what symptoms?

Another question, what wires and plugs best in autozone. And one more do i have to gap the plugs or just buy it and install it. 2003 imp,3.4eng,85000m

bigrod118

The best spark plug wires are the OEM GM stock ones.

I have never HAD to gap any spark pugs, but I do always check them. you can just buy a gap ckekcer at autozone, they are $.99.

JJ Newel

Do you think it would be hard to remove these plugs at 100K miles or should I just spray PB Blaster or WD-40 on it to help me break these plugs free been wanting to change them but afraid they will be stuck to the heads ANY HELP???????

JJ Newel

By the way i have a 2002 3.4L impala

bigrod118

no, dont spray anything in the plug holes, when you go to take out your plugs, that leaves a hole into your engine, and you dont want anything thats not supposed to be in your engine... in your engine.

JJ Newel

No, I'm talking about before pulling the plugs. Otherwise how would I get these plugs out????? Don't forget these plugs do stay in the engine for 100,000 miles. Would it still be easy to take them out. Any tips to know about.

bigrod118

well, if you soak them in rust eater or something, how are you going to get the rust eater, out of the plug holes? you cant really shove a rag or anything in there to soak it up, trust me I tried on my old car, and I ended up having to let it sit overnight to let everything evaporate.

really the only thing you can do is try to take them out, and if they are stuck, well, I dont know, I have never had any plugs sieze into the heads.

JJ Newel

Good point

JJ Newel

WAIT what about using a hair dryer?

JJ Newel

to dry up the rust eater of course.

BNaylor

Normally a MAF sensor in bad shape will trigger a odb-ii DTC error code and a SES/CEL light. However, they have been known to give driveability problems without any codes too.

One symptom of a bad MAF is erratic or no idle. Engine will stall out or you have to hold the rpms up to prevent stall. May be accompanied by engine backfire or black smoke out the exhaust.

Another is similar to a clogged CAT where your acceleration will be poor or it will miss or cutout at 3K - 4K rpms. The effect will be felt when accelerating or WOT and while the PCM is in open loop mode.

A MAF sensor is hard to check. You can check the 5 volt reference signal from the PCM. The output back to the PCM is a frequency based signal proportional to airflow. To check it you really need an oscilloscope or a diagnostics program like AutoTap. Otherwise you're stuck with controlled substitution to rule it out as a problem.

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ysteve

Thank you Bnaylor3400 you really help me. I sent you before on private mesages. So looks like we check everithing and still this problem.
Alright one more thing, how i can check the coils?(how many ohms) Or maybe you can think something else?
Thank you again.

ysteve

Another question where usually we have vaccum leak?

MT-2500

On spark plugs use the oem AC-delco the book calls for.
If they hand you bosch or something else pitch them back and get the good AC.
Always check the gap because somebody could have droped them.
But beside checking the gap center the tip with the electrode.
I have found a lot of the off center. On the double platinum tips center the two platinum tips with each other. single platinum just center the tip with the electrode.
Hold your plug with a wrench and grab the tip with a pair of pliers and twist it to center the plug tips.
Also a little dab of anti-seize wll help someone else get them out the next time.
Skunk pee or penetrating oil will not help to break a plug lose. It is sealed where it screws into the head. If one screws out 3-4 threads and then gets real tight it might help or might not. Or just cross your fingers and hope it comes on out.
That is one good reason to change the plugs before 100k
Good luck
MT

__________________
Remember proper testing gives us the answer to many problems.
MT

MT-2500

On the mas air flow sensor watch the baro readings and fuel trims in the computer.
If you need a chart E mail me at crunch@troublecodes.net for a pdf on it.
Or if private e mail will take a pdf try that.
MT

__________________
Remember proper testing gives us the answer to many problems.
MT