89 running rough
Thread Starter
Heel & Toe
Joined: Sep 2011
Posts: 22
Likes: 0
From: Indiana
89 running rough
My 89 with 118,000 miles has been giving me alot of trouble lately. I have to crank it over for several seconds to start it. Once started it barely stays running. It wont go above 2500 RPM no matter the position of the throttle.
In the last 500 miles I have replaced the distributor cap and rotor, coil, air filter, fuel filter, and cleaned the MAF.
any ideas on what the problem could be?
Thanks in advance.
In the last 500 miles I have replaced the distributor cap and rotor, coil, air filter, fuel filter, and cleaned the MAF.
any ideas on what the problem could be?
Thanks in advance.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Could be low fuel pressure. Check it at key-on and while running. Should be roughly 40 PSI.
You can check the fuel pressure regulator by removing the vacuum hose while the engine is running. The pressure should go up to about 50 PSI (this test simulates low vacuum at WOT).
You can check the fuel pressure regulator by removing the vacuum hose while the engine is running. The pressure should go up to about 50 PSI (this test simulates low vacuum at WOT).
I'd start with the fuel pressure regulator, check the ohms of your injectors as well.
