1993 Ford Mustang Repair Question
Why does my car jump and buck and have no power?
Did you check the engine compression?
Is the MIL indicating and did you check for troube codes?
1. Turn all accessories off. Set parking brake, and block wheels. Connect timing light to engine. Disconnect single in-line Spark Output (SPOUT) connector (Yellow/Light Green wire) near Ignition Control Module (ICM) at distributor.
2. Start engine and warm to normal operating temperature. Place transmission in Park (A/T) or Neutral (M/T). With engine at idle RPM, check ignition timing. Turn engine off. Reconnect in-line SPOUT connector. Check computed ignition timing. Computed ignition timing should be advanced beyond base timing.
BASE IGNITION TIMING
Degrees BTDC @ 10 @ 575-725 RPM
Thanks for the reply. I checked firing order and it is correct. I found the plug at the distributor and checked the timing and corrected the timing as best I could since it will not idle smoothly but still it is pretty close. After asking my brother more about the car and what he did to it I found out that he had also cleaned the mas air flow with spray brake cleaner and that replaced plugs, not wires, cap and rotor button. I checked and it is getting good fuel at the bleeder valve, but I don't have a pressure gauge so i can only say this. It has compression. When at idle it lopes and idles very low but as soon as you tap the gas it picks up smoothes out for a second and does the same lope and low idle. I can hold it at about 1200-1500 rpm and it sounds like a spitback noise from a carbed motor but not as loud and definite. My brother also said that this is one reason that he stopped driving it and let it set for about a year then that is when ants got in the computer. Could it be fuel injectors and is there a way to check because they are not cheap? what can we check now?
1 question asked
Symptoms indicates the idling speed is not stable. Check the throttle bore and if it is dirty, give it some cleaning with carb cleaner. Have the IAC cleaned as well.
I cleaned throttle bore and the IAC it seemed to pep up a little but the idle is still off and if I hold it at about 2000rpm it will speed up and slow down. I drove it up the road and it has picked up some but it still bucks and jerks like it is giving out of gas. It makes like a thud sound and then it picks up, thud sound, picks up. I mean it nose dives. Any more ideas? PLEASE
1 question asked
Get a DVOM and ohm out the plug wires. None should be infinity or anything above 20k ohms. You mentioned that you have compression but did you test the readings?
Anyway the symptom description indicates it is more likely to be ignition related rather than engine mechanical.