Question about 1986 Ford Tempo
Great car and one of my favorite ford's from the 80's. I wanted the 2 door coupe, but was too young to but one, now I never see them anymore.
The issue you seem to be have is either vacuum related or transmission related. I say this because when you put the car in drive, you add a load to the engine. If there's any kind of vacuum leak, the engine is them starved for air and can't idle like it should. I'm also going to assume that while in park or neutral, it idles fine??? There are 3 component's needed for an engine to run. FUEL, SPARK and AIR. Remove one of those from the mix and you ain't going anywhere. I mentioned the transmission before because I had a similar issue with an old 1966 Lincoln I had. Ran flawlessly, then one day at a light it kept dying. It was a main seal.leak between the engine and trans, but since you have a front wheel drive vehicle, I would start with checking the vacuum lines and hoses to make sure they're all connected and tight.
Posted on Apr 04, 2017
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Posted on Jan 02, 2017
Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Posted on Apr 10, 2009
Check EGR valve this controls idle speed it might have carbon build up hold the valve open. All so check fuel pressure.
Posted on Jun 26, 2009
i am trying to install an aftermarket temperature guage with capillary tube into my 1988 crown victoria ltd 5.0 efi. where does the capillary tube mount?
Posted on Oct 06, 2009
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Dec 20, 2014 | 1986 Ford Tempo
Mar 24, 2014 | 1993 Ford Explorer Limited
Engine stalls cold or RPM
fluctuates at idle up and down or dies near idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If the above cleaning doesn't cure your issues you need to have the computer controlled automatic idle speed control system diagnosed and repaired by a dealer or electronic engine control repair shop.
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