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What could be the problem with a 1989 f150 if the iac and tps and fuel pump have been replaced and the truck still cuts off after a minute or two?
Wiki User
∙ 17y ago
There are many many possibilities. It sounds like you missed the most important step in the repair process. Diagnosis! Start by finding out what you are missing, either spark or fuel. That is simple. When the truck acts up, pull off a plug wire, have someone crank the truck over while you hold the end of the wire close to, but not touching, the engine block and see if you have spark. If you have no spark, then possibly you need an ignition module, coil, and stator. If that is the case, please save yourself future headaches and replace all three(module, coil, and stator). If you have spark, then you are losing fuel. That doesn't neccessarily mean fuel pump. The pump could be giving you pressure, but if the injectors are not pulsing, you dont get any fuel into the cylinders. If that is the case, then PCM could be the culprit, or you could be losing power, one of your grounds, or a information to the PCM that it needs to pulse the injetors. Of the 60 pins that go to the PCM about three of them will be power and about 5 of them will be grounds, so you really need to know what you are doing if you get that far. But I doubt you will, because have a gut feeling your ignition sstem is breaking down and you will probably need the aforementioned ignition module, coil, and stator. Also check your m.a.p sensor. same thing happened to me and that was the problem. (little black box on passenger side fire wall.)
Wiki User
∙ 17y ago
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