Hi all,

My 89 350 is hard to start and I don't know where to go from here.

I have to prime the fuel pump 2 to 3 times to get it to start when it is cold.

Only once when it is warm.

Already replaced the following:
Cap/Rotor
Plugs/Wires
Injectors
Fuel Filter

What do I do next?

 

Anyone? I have a similar issue.

 

bad cold start switch or cold start injector typically

 

NOT IN 1989

 

Mine tends to idle high for a bit too, almost to 2k rpm. Doesn't go down until you drive it for a short time. Not sure if that would be related.

 

didnt see that, only had csi up to 88, 89 the ecm does injector enrichen instead

 

THE MAF TPI SYSTEM IS JUNK. ALONG WITH THE STOCK INJECTORS.

I REPLACED MY INJECTORS AND IT GOT BETTER.

I PURCHASED A STAND ALONE SPEED DENSITY HARNESS,ECM AND PROM.

CURED EVERYTHING............HOT START ISSUE,LONG CRANK,IDLE SURGE,COLD STUMBLE.

EVERY PROBLEM ANYONE HAS EVER COMPLAINED ABOUT I HAD,I TRIED EVERYTHING.

ONLY THING THAT GOT IT RIGHT WAS THE INJECTORS AND CHANGING IT OVER TO SPEED DENSITY.


SORRY ABOUT THE CAPS LOCK

 

 

Yeah, I've had a lot of problems in the past with the MAF, but managed to solve them all with time. It actually is a rather efficient system (when it is working). I do think the cold start injector is likely my problem. I recently replaced the injectors with modified Bosch 3's so the injectors should be alright, I'll check the CSI later on. Thanks for the feedback.

 

you have the cold start injector , the OP does not.

you can eliminate the cold start on your car with a 89 prom.