89 ford bronco 2 starts fine, idles fine,

givit a tune--new distributer cap--new plugs and cables--------also have air intake cleaned plus idle control--use a nonchlorinatd solvent sold a napa etc

You really should have said what times you had problems.. Just saying at times does not help. If the engine is hot and is hard to start you should look at the heat shield between the exhaust and the starter. a hot starter = hard to start. ALSO if your timing is advanced it will cause it to be hard to start. also if your battery is weak.

It could have a weak or failing ignition coil. The other thing I can think to look for would be an exhaust restriction.. (clogged catalytic converter)

What about the fuel filter?? was it replaced?

It sounds like the timing is too far advanced or a vacume leak. Spray some carb cleaner around the vacume lines and see if the idle changes.

the first check the catalitic converter. the engine can't breath. second is the oil sending unit.

Try replacing the Throttle Positioning Sensor
Have the codes checked
You may need to clean the Mass Air Flow Sensor
this is best done by a professional as it contains some very sensitive wires and they are easily broken
The MAF is very expensive to replace

change plugs...........

There are shift solenoids in the transmission and apparently there's a problem them. I would get it to a trany shop and have it checked right away. If you continue to drive it you will ruin the transmission. Are sure you put the right computer in the vehicle? If you put a computer from a Bronco II with a manual trans in a vehicle with an automatic trans, the trans won't work right.

Hello! You have symptoms that point to incorrect fuel pressure.
First have the fuel pressure tested as follows; #1...engine running at idle: 13- 20 psi. #2...key on engine off: 23-30 psi. If pressure is incorrect change the fuel pump.

Does the engine "surge" at idle? If so, check the "fuel injection pressure regulator idle air control valve". Apply a vacuum to it; If fuel flows it is not the problem.


Guru.............saailer




I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

clean out the carbs sounds like a blocked jet to me look at the air filter too,