View Single Post
Old 09-02-2007   #5
tomtom72
 
tomtom72's Avatar
 
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,609
Default Re: Help!! 91 missing/underpower issue

Okay now we're getting somewhere! If it misses all the time my next Q will be;

does the miss get worse as the motor comes up to proper operating temp?
If yes then it's not looking good for the OEM injectors.

Q2; Do you know what a lean condition smells like? Stand behind the car & get a good wiff of the exhaust...if it makes your eyes water &/or smells kind of acrid then ya have a lean burn....bad injectors, maybe.

Q3; did you run down any DTC's? Post up if you have them.

Q4; do you have a scan tool, need that to look at the fuel numbers. Oh, and a FSM.

Q4; Did you pull any plugs & take a look at the burn pattern? Do they look too clean, do they look dry, like they saw no gas? If so the fuel filter is blocked solid or the primary injectors have coil failure. Outside shot could be the injector drivers in the ECM, or maybe bad injectors relays. You have good fuel pressure?

FWIW, you can test the ohms reading on the injectors thru the ECM harness but ya need the FSM for the pin numbers. I believe above 16-18 ohms is okay but don't quote me on that one. Oh, if you ohm them you should do them stone cold and after the motor gets hot. Usually they break down more severly the hotter they get.

My guess....just a guess mind ya...is the primaries sound like the have died & gone to meet their maker.


Tom
__________________
1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member
tomtom72 is offline   Reply With Quote