1989 4.9 Idle Question??????
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Mountain Pass
Joined: Mar 2006
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1989 4.9 Idle Question??????
I have a 1989 F150 4.9 Mazda 5-speed 2wd truck that I just bought. The truck sat for about 2 years and I have installed new fuel filter, air filter, breather filter, pcv valve, new Motorcraft plugs, Autolite wires, new distributor cap & rotor button, cleaned out the throttle body and IAC valve and I still have a cold start idle issue.
When you first start the truck it will want to die unless you hold it to around 1500-200rpm for around 30-60 sec, then it will idle normally. I have also had some bucking and hesitation that I believe to be either old gas or water in the gas where it sat for around two years.
I believe I have gotten that solved as it hasn't bucked any the last two times I drove it. I pulled codes and the only code was for neutral safety switch. Any ideas as to why it wont idle until it gets some heat in it???
When you first start the truck it will want to die unless you hold it to around 1500-200rpm for around 30-60 sec, then it will idle normally. I have also had some bucking and hesitation that I believe to be either old gas or water in the gas where it sat for around two years.
I believe I have gotten that solved as it hasn't bucked any the last two times I drove it. I pulled codes and the only code was for neutral safety switch. Any ideas as to why it wont idle until it gets some heat in it???
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