I'm clueless. I have an 84 Hot Air. Replaced the following: fuel filter,pcv valve, egr valve, spark plugs AC at 0.32, new 8mm wires.
I've checked fuel pressure at it sits at 30~31 PSI at idle and 37~38 with the vacuum hose off.
I've turn down the boost to 10 PSI and I still get popping.
Knock gauge lights up sometimes on the first 1 or 2 green lights. The popping sometimes is very loud, sometimes not as loud. Like it flutters. flu,flu, flu, pop.
This is ONLY under boost on hard accelaration and very seldomely under light accelaration .
I hear a light tik, tik , tik somewhere in the fron of the engine. Somewhere in the pulleys area.
I don't want to give up on it. The car runs real good most of the time except for that annoying and sometimes enbarassing POPPING !!!!
Don't have scantool just the knock gauge. The knock that it sometimes read, I believe is because of the popping is sometimes loud causing it to be false knock but not sure. When the popping is light then I get no green lights.
This is if I'm just gunning the pedal. I will try my best to simmulate :
turbo..ssssssss, flut,flut, pop, pop, ssssssss
is intermitent.
Does the boost spike at time of popping? If so.
Try unpluging the waste gate solonoid valve and plugging the end. It's located on the right hand side valve cover.
it was my coil pack. Bought one from Auto Zone that came with an adapter to convert to the 87 GN style.
What is the auto zone part # on that?