injector help

[fuzionR]

hey guys. I just woke up this morning to find that my 94 Q45 Is just idling really rough. The check engine light came on and as i drove for 2-3 miles it went away. Everything worked fine again. I shut off the car and bam, the light came on again and it was idling rough. I checked the code and it read 34 and 51. I checked the OHM's on all the injectors and it was constant at 11.35 on all 8. It comes and goes. The car will be fine then bad.... I have no idea guys. Seems like the fuel injectors are fine. And clues? my car has 142K and had been working fine for 2-3 years. well kept and all regular maintenance was done. What are your thoughts guys?

[maxnix]

BG44K regularly?

[NSRG50]

might want to check the conection on the Mass Air Flow sensor, i'd start there. check Q45.org . for more info

[fuzionR]

ITs not the MAF. Maf was replaced already. When the maf was bad it would sputter sometimes but that was replaced with a new one and it was A ok. BG44K was already done to it 2500 miles ago. Still no luck. Tried Chevron Fuel cleaner today for now. ARGGG. Like i said the Check engine light was number 51 (fuel injectors) and 34 (Knock Sensor) but i checked those and its fine. Clogged Fuel injector? resistance is fine. ? its obviously not the fuel pump. no humming and starts right up.

[Q451990]

Good chance it's a clogged injector. Since everything ohmed ok, it's time for a pressurized rail flush ASAP!

Heath

[goody90q45]

might want to check the connection on the Mass Air Flow sensor, i'd start there.

ITs not the MAF. Maf was replaced already. When the maf was bad it would sputter sometimes but that was replaced with a new one and it was A ok.

What Joe is saying is to check the connector, not the MAF itself. Make sure all 3 female pins are clean, crimped and lubed with dielectric grease and provide a solid, tight connection to the MAF. When the pins are crimped properly there should be little to no wiggle in the connector.

I agree with you that it's probably not the pump since the ECU is throwing the 51 code. Just for kicks though have you unplugged the fuel pump from the FPCU, examined the connector and plug for burning, and grounded out the fuel pump with a jumper to see if she runs good on high speed only? If not it's something you should think about doing if our other suggestions (guesses) fail.

The 34 code is a dead KS. It's not related to this issue but have you ohmed them lately? Q45.org is a great site for the Q owner and in the tech help section you'll find easy to follow instructions for doing everything I've mentioned so far.

Finally, what is the condition of the rest of the connectors in the engine compartment. Any green corrosion or loose connections to the MAF, Crank angle sensor, sub-CAS, throttle position sensor, injector plugs 1-2-8 (easy to check). If you're finding green stuff on any of these connectors it could easily be causing the problems you describe. Clean them up and see if she runs better. Good luck.

[fuzionR]

thanks for all your help guys. Everything mentioned about the maf i did a month ago. I did it again today and no luck on the maf. It didnt effect anything. So Maf is definately OK. I may think i need a fuel rail flush. I'll keep you guys updated. Keep ideas comming. I appreciate it guys.

[fuzionR]

Thanks for the help guys. I needed the injector flush......All works now

[mxr662]

What brand of flush?How much?

Mine was a bit rough after the 20 min drive to work this morning.

[fuzionR]

I used BG 44K... Put that in the fuel tank.... and my car went from .... bararaBING BING POP BING BING BING BING to..............VROOOOmmmmm... LOL..... My car was like Mario after he ate a mushroom.

[Haitian_King]

I used BG 44K... Put that in the fuel tank.... and my car went from .... bararaBING BING POP BING BING BING BING to..............VROOOOmmmmm... LOL..... My car was like Mario after he ate a mushroom.

LMAO. Mario.

I wanted to get some BG in before my last oil change, but it looks like I'll have to wait until my next one.