87 4.9 high idle
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From: blackcreek ga
87 4.9 high idle
just bought an 87 4.9 efi and it wants to idle up @2000 rpms when its at operating temp and wont idle down.checked all hoses and most everything has been replaced except for tps,map. any help? its a 4 speed.
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From: Broken Arrow, OK
Originally Posted by Ed_B
No problem. I don't know if that will solve your idle problem.
I hope that it does. I don't know how they test a TPS to see
if it is working OK or not. Maybe by its voltage output?
Anyone know for sure?
Ed
I hope that it does. I don't know how they test a TPS to see
if it is working OK or not. Maybe by its voltage output?
Anyone know for sure?
Ed
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Thanks for the TPS test procedure, SS. That could definitely
come in handy one of these days.
Ed
come in handy one of these days.
Ed
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From: St. Peter
another thing to check would be your fuel pressure regulator, this happened to my 88 when my FPR went out, idled at like 1500 Rpm and then it would idle funny and everything. But it actually sounds like a vacuum leak, or a bad IAC valve.
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From: blackcreek ga
new iac and the tps fixed the problem except for a slight surging but its very minimal. ive checked all vaccuums but the charcoal canister crap might be a problem. also the map sensor. im gonna replace the map this weekend and see if that helps. thanx much for all your input and stay in touch.
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