nickid

my 2.8 was popping and losing power so I thought I would change the maf but its still doing it?
pulled each lead when it was running and all sparking well. what next?

silverd2

"Popping" ? ...more specific detail please.

From the tail pipe? ...backfiring?

Under the hood? Just while accelerating?

nickid

sounds like under the hood. I can drive slow and nothing but as soon as I want more power it pops once like a light bulb popping

nickid

oh and no fault codes

Kneale Brownson

You might get a more knowledgeable audience at the correct model forum.

nickid

Don't understand. my car is an a8 d2

silverd2

Does not sound like anything I've heard of. Can you feel anything when you hear the pop?

No codes doesn't help much.

With a valve or valve timing problem, any car can backfire back through the intake. So, since you have a loss in power also, I'd start with a close inspection of the valve timing. You'll need to have the upper timing belt covers off, then set the crank pulley (hand turn engine with a socket wrench) to TDC at the marks. The engine hits TDC twice during a cam revolution, so if the large cam timing holes are not facing inwards, then one more rev to TDC again. Proper timing is TDC at the crank and the timing holes dead level across, with large holes facing in (every 2nd turn of the crank)...see drawing.

If the timing is correct, you might want to move on to a compression check.

The above are just guesses based on very little info.

nickid

Thank you for getting back to me. Will get a check in the morning.
Just put injection cleaner in tank and I let it run a while and now letting it sit over night.
Hope its just a blocked injector

Kneale Brownson

Your first post started, "my 2.8 was popping..." I figured the 2.8 referred to a different model.

nickid

Thank you for getting back to me. Will get a check in the morning.
Just put injection cleaner in tank and I let it run a while and now letting it sit over night.
Hope its just a blocked injector