Mabii

Ok every time I go full throttle the car starts to break up above 2700rpm and I cant figure out why. I have replaced every thing in the ignition system new fuel pump and filter new maf, egr valve and new o2 sensors. The guy at auto zone said it could be caused by a loose ground wire but is this true? Any help or input would be really great.

mjr46

what does you replaced everything on ignition mean???

Mabii

New dizzy new coil new plugs wires cap rotar every thing.

mjr46

have you cleaned the MAF?? checked fuel pressure while trying to run at wot?? and or run a koer test to check for codes??

Mabii

Replaced the maf with a brand new one and I bought the obd1 tester and its throwing no codes, Forgot to mention it doesnt do it 100% of the time only about 90% of the time.

mjr46

verify fuel pressure remains constant and in spec at idle and at WOT

mjr46

ALSO WHAT PEOPLE CALL THE SALT AND PEPPER connectors behind throttle body were an area of concern that can cause various drivibility issues....clean and install contact promoter in the pin connections if they are thought to be an area of concern

Mabii

How do I do that?

mjr46

for the fuel pressure test??? you connect a gauge to the schredor valve on the rail and tape the gauge to the windshield and watch for it to drop at wot, if it is a volume/supply issue normally it'll drop drastically or be somewhat obvious.

Mabii

Ill have to go buy a guage then and ill try those connectors too.