high idle
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Junior User
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high idle
Hello and Help!
I have been having a high idle problem with my 91 E150 302 for quite some time. I have replace the IAC and TPS (the bare wires were exposed) and all of the vacuum lines look solid. I had the EGR tested by a friend and it tested fine although EGR codes show up when I have had it tested at autozone. One of the vacuum lines that leads to the canister under the van I put a plug on because the canister had rotted away awhile ago. I am stumped. Other things to note...may they be related in some strange way... when the van is on the express way and I am accelerating, the fan (the ac/heater fan) will stop until i let up off the accelerator...this is a new problem. The high idle make for dangerous winter driving and it is wasting expensive gas! Anybody have the same problem? Thanks!
I have been having a high idle problem with my 91 E150 302 for quite some time. I have replace the IAC and TPS (the bare wires were exposed) and all of the vacuum lines look solid. I had the EGR tested by a friend and it tested fine although EGR codes show up when I have had it tested at autozone. One of the vacuum lines that leads to the canister under the van I put a plug on because the canister had rotted away awhile ago. I am stumped. Other things to note...may they be related in some strange way... when the van is on the express way and I am accelerating, the fan (the ac/heater fan) will stop until i let up off the accelerator...this is a new problem. The high idle make for dangerous winter driving and it is wasting expensive gas! Anybody have the same problem? Thanks!
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Junior User
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I pulled the codes yesterday and I received a two codes #12 & #13 that it could not control the RPMs during the self-check at low RPMs and high RPMs. and another code 45 that said Thermactor Air System, system upstream during self-test. Anybody ever have these codes and fixed it?!? Thanks!
Cargo Master
Joined: Dec 2003
Posts: 2,182
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From: Saint Augustine, FL
You have a big vacuum leak somewhere. That's causing the high idle. Its also causing the HVAC to change under load because it is vacuum actuated.
A high idle and the HVAC problem are classic symptoms of a vacuum leak.
Steve
'95 Clubwagon XLT
A high idle and the HVAC problem are classic symptoms of a vacuum leak.
Steve
'95 Clubwagon XLT
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Thanks! I am going to look into that tomorrow. I have been having trouble getting it started after I have been driving it for about 30 min and then letting it sit for about 30 minutes. It seems to always start when it is cold...but real TROUBLE within an hour after I have driven it. It will crank real strong but just wont start. Any ideas?! Eventually it will get going. ???
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Originally Posted by 91Van
I pulled the codes yesterday and I received a two codes #12 & #13 that it could not control the RPMs during the self-check at low RPMs and high RPMs. and another code 45 that said Thermactor Air System, system upstream during self-test. Anybody ever have these codes and fixed it?!? Thanks!
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Junior User
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I have checked all of the vacuum lines and hoses and they all seem to be good. When you completely block off the throttle body it brings it down to a nice idle and does not stall out...so air is getting in somewhere. I attempted to check the gaskets on the intake manifold by spraying carb cleaner while the throttle body is blocked off and the engine is running and pretty much did not get a response from the engine although many of the areas are hard to get at. Any suggestions at testing the manifold gaskets??? I figure its got to be them, but would like to know for sure before going to the trouble of replacing them! Thanks!
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Joined: Mar 2005
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I've owned four ford vans with the 302 engines and twice had the high idle problems in the past. Once it was caused by the egr valve being gunked up and the other time one of the rubber caps that plug the spare ports on the vaccume port (where all the hoses connect under the intake manifold) was rotted away. That area is hard to see I used a small mirror on the telescopic wand with a flashlight.
Lon
Lon
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Thanks everyone for all of your suggestions, a friend and I narrowed the leak down to the EGR tube that goes from the manifold to the EGR valve. An expensive little tube, but back to the way it is supposed to run.
More Turbo
Joined: Jun 2004
Posts: 690
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From: Sweden
OK first off, you need that vac canister in there!!
The plastic "cocktail straw" vac lines over the passenger side exhaust manifold are prone to hardening and cracking.
One other option is an intake manifold leak- plenum to upper. Lets in unmetered air which increases idle speed.
The plastic "cocktail straw" vac lines over the passenger side exhaust manifold are prone to hardening and cracking.
One other option is an intake manifold leak- plenum to upper. Lets in unmetered air which increases idle speed.
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Hi Dannym,
It was not the line to that canister that I plugged off...My van had another canister on the driver side of the van...i was told that i could get by without it. But i solved the problem by replacing the EGR Tube!
It was not the line to that canister that I plugged off...My van had another canister on the driver side of the van...i was told that i could get by without it. But i solved the problem by replacing the EGR Tube!