Help Code 34 KOEO
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I have an 87 5.0 Mustang that will not start. It cranks but does not run. I have checked all, fuses, relays, fuel pump, inertia switch. I changed the coil, distributor cap and rotor, TFI Module, fuel filter, and nothing. I am only getting code 34 from KOEO test. I don't know what else to try. Anybody have any ideas? I would greatly appreciate it. Thanks.
My next guess is the ignition switch. Hope it works...
Posting Guru
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f150andMustang, I'd also suspect the TFI/ICM module, but if you've checked or changed it, then look for a CPS sensor near the harmonic balancer. I'm not sure if you have one since you have a distributor, but it's worth a look. If these go bad, you get no spark signal from the ICM.....
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Yes, I have changed the TFI module and nothing. I don't know which is the CPS sensor or harmonic balancer. I think there is a spark coming from the distributor, but still no firing. Most of the time I can figure out what is going on, but this time I am lost. Any other ideas?
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OK, ignore my previous post, I don't think you have a CPS (crank postion sensor) on an 87.
If you're getting a spark from the distributor, it should start if there's fuel. Maybe check the fuel pressure at the fuel rail with a gauge, or remove the air tube at the throttle body, and spray some starter fluid into it while cranking.
If it fires using the starter fluid, then it's a fuel problem, probably a bad pump. If not, then remove a spark plug, ground it on the engine, and see if the plug fires when cranking the engine......
If you're getting a spark from the distributor, it should start if there's fuel. Maybe check the fuel pressure at the fuel rail with a gauge, or remove the air tube at the throttle body, and spray some starter fluid into it while cranking.
If it fires using the starter fluid, then it's a fuel problem, probably a bad pump. If not, then remove a spark plug, ground it on the engine, and see if the plug fires when cranking the engine......
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