91 q45 maf problem

[prtrillaboss]

Quite long but detailed, please help.

Did an oil change so I removed the air box and maf to get to the oil filter, all that went just fine. Go to put the air box and maf back on plugs up just fine go to crank the car and it stalls, crank it up again and the check engine light comes on motor stalls. Turn the key off, unplug the maf plug it back in. Start the car again and everything as normal. Go to back the car out and the check engine light comes back on and stalls. Go to crank the car again and check engine light comes on, wont rev. above 3k. I figure the maf has finally gone. I drive it home slowly, and end up running out of gas, didnt have much in there before the oil change. Lucky I got it into a parking lot. Get a few gallons of gas in the car, it has trouble starting then finally stays running with check engine light off then drive it to the gas stataion. Fill up the car with 93 octane, car starts first crank check engine light off. Drive it home check engine light comes on. I check the maf connections it looks ok with slight oxidation, clean the terminals on the plug and the maf. Plug it back in go to crank it, cranks a few times then finally turns over. Runs for a couple min then stalls. Turn the key again starts the car then dies. Try it again and just cranks, finally end up killing the battery. Take out the battery and trickle charge it over night. Clean the inside of the maf with maf cleaner. Put everything back in go to crank the car up, cranks a few times then starts. Check engine light comes back in and wont rev. over 3k. I took the maf off and inspected the inside with what is decribed as the "light bulb" it looks like the flat metal stip which looks like it used to be red is now white and in the center of it looks like a burn mark. Now I could be wrong but I have not looked at other q45 mafs to cross check and with it not rev. over 3k and the check engine light on and only removed the airbox and maf it makes me think some how it got messed up.

I should note that the ecu had no power overnight so the codes should have been clear and that there was no prior issue with check engine light before.

Any help would be greatly appreciated

[qship96]

"Did an oil change so I removed the air box and maf to get to the oil filter"

That was your first mistake.............

[goody90q45]

Tighten up the MAF connector pins so they look like the one in the middle. Clean off any corrosion and coat with dielectric grease.

[prtrillaboss]

Tighten up the MAF connector pins so they look like the one in the middle. Clean off any corrosion and coat with dielectric grease.

I'll do that, I did use dielectric grease when I had put the plug back on and see if that changes the problem

[prtrillaboss]

Tighten up the MAF connector pins so they look like the one in the middle. Clean off any corrosion and coat with dielectric grease.

Bent the pins as shown in the photo, still same effects as before. Hard to start, finally does and check engine light on.

If the maf is burnt/faulty is it possible to switch the maf from stock to a z32 one?

[Infinitiguy19]

If the maf is burnt/faulty is it possible to switch the MAF from Q45 to a Z32 one?

Nope because they are different.

Would be nice to see what codes pop up because the CAS is near the MAF sensor and I am sure you see it when changing oil filter from top.

[prtrillaboss]

Nope because they are different.

Would be nice to see what codes pop up because the CAS is near the MAF sensor and I am sure you see it when changing oil filter from top.

Well I know it has a different plug but if it would be changed with wiring in the pig tail, if not no prob. just courious.

I did see the CAS and I checked the plug and it seemed fine with no wiggle on the plug. as well as all the other plugs that I could see around the motor even though I only removed the maf.

I took the intake box/maf off to get to the oil filter is there was no way to get to it from the underside and this was on a lift so I lowered it and got it from the top, as I would assume most people need to do the same.

[Infinitiguy19]

Let me get this right...you have a lift and still change the oil from the top? Most people with a lift wiggle there hand in there and change it from the bottom. Now doing it from the top isn't ideal if your not gentle, but if you are then you will be fine. And I am referring to being gentle with MAF connector.

Check and see no oil was spilled on the CAS connector from the oil filter.

MAF would limit engine speed to 2000 RPM's, CAS limits engine speed to 3000 RPM's so unless there is a typo it seems for the moment the CAS is at fault. Or you really for changing oil from the top when you have a lift, Live and learn though.

[prtrillaboss]

Let me get this right...you have a lift and still change the oil from the top? Most people with a lift wiggle there hand in there and change it from the bottom. Now doing it from the top isn't ideal if your not gentle, but if you are then you will be fine. And I am referring to being gentle with MAF connector.

Check and see no oil was spilled on the CAS connector from the oil filter.

MAF would limit engine speed to 2000 RPM's, CAS limits engine speed to 3000 RPM's so unless there is a typo it seems for the moment the CAS is at fault. Or you really for changing oil from the top when you have a lift, Live and learn though.

I wasnt about to try and get my hands stuck, they are large as well as my forarms but that beside the point. From the top was much easier and I didnt mind removing the airbox/maf and was careful with the plug.Theres no oil on the CAS everything was dry when I put the new filter on.When I rev the motor it hesitates at 2000k and holds at 3000k, this only happend after removing the maf.

My question still... is the maf any good with a burnt looking metal strip on the "lightbulb" or is that normal?

[Infinitiguy19]

Were better off narrowing the problem down with the ECU codes no offense. But I bet that its the CAS that's the problem or something else you may have unplugged under there.

[prtrillaboss]

No offence taken, just trying to list everything how it was either done or how I did it so we can, like you said narrow it down. Nothing else is unplugged but very fishy the CAS would fail due to removing the maf. I'll recheck everything tomorrow, again the car ran very well before removing the maf, apon putting it back in place and connecting the plug going to start the car the check engine light came on.

[prtrillaboss]

Problem solved, was the CAS like previously mentioned. It now runs again like a champ,

Thank you for your help guys