1987 ranger
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1987 ranger
hi im new to this site. but i was hopeing that someone on here might be able to help me out. ok i got a 1987 ranger xlt 4x4 with the 2.9L. my problem is if i drive it for a little whil and shut it off, when i start it back up, the engine revs up to about 3000 rpms for a few seconds. it just started doing this, it dont do it all the time only once in awile. i repaced the idle air motor, pvc valve, and the air temp sensor. i cant find any vacuum leaks. so if someone could help me out it would be great
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From: Ishpeming Mi.
The EGR can sometimes be cleaned, which is an easy enough thing to do.
Did you do both the KOEF and KOEO?
Start by cleaning it, disconnecting the battery at the same time so you can pull fresh codes when you start it back up.
Are you sure that the engine is reving to 3 grand? Mine started warm at a higher rev which lasted for a couple of seconds and then dropped right down to where it belonged. To me it was just a normal startup but I had bought mine used and tired. I still got 5 years out of it.
Did you do both the KOEF and KOEO?
Start by cleaning it, disconnecting the battery at the same time so you can pull fresh codes when you start it back up.
Are you sure that the engine is reving to 3 grand? Mine started warm at a higher rev which lasted for a couple of seconds and then dropped right down to where it belonged. To me it was just a normal startup but I had bought mine used and tired. I still got 5 years out of it.
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the egr was disabled but it just started doing this. yes i ran both tests. and yes it reves up to 3000 rpms. it dont do it all the time. it seams to be when i drive it for a few miles and shut it off, than it will do it. this is not normal start up becuse some times it goes a little higher. also if i up plug the idle air motor it wont do it but it idles ruf
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From: Perry,Ga.
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From: Yes
You got no codes KOER? The tricky part is that by plugging the IAC tube, you're simply choking the motor. The significant thing about this is that this means the ECM is telling the engine to rev that high. Have you noticed any other symptoms? Rough idle, low on power, poor milage, things like that? If the ECM is revving the engine that high, it is getting a signal telling it that this is necessary. ECT Sensor comes to mind. Though I will say this from experience, with the EGR system disabled, it is impossible to diagnose this accurately. It's kinda like trying to figure out why your car wont start while jump starting it, who knows, might be the dead battery! I would strongly suggest getting the EGR system fixed, you'll run better and prolly get better milage.
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no it gets about 22 mpg like it always has. no it idles smoth. the egr has not worked sence i got the truck and it just started doing this about 2 weeks ago. where is the etc and whats it do? i also noticed that if i try to move it when its doing it. its weak and acts like its going to stall. i was going to try the map sensor but i dont know if that has anything to do with it doing that.
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From: Lake Almanor
ECT is the Engine Coolant Temperature sensor. This is just to the passenger side of the coolant inlet on the intake manifold. If it malfunctions it tells the brain that the engine is cold and activates the warm up features, IAC, higher idle, etc. If it has an intermittent problem, check the plug to the ECT. I had one go bad and it took a while to throw a code on that.
I have an '88 without the EGR so I can't comment on that, however it makes sense that a clean, opeerating one would be the ideal situation.
Good Luck
Rich
I have an '88 without the EGR so I can't comment on that, however it makes sense that a clean, opeerating one would be the ideal situation.
Good Luck
Rich
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Joined: Jul 2007
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From: Rhode Island
Random 3000 RPM idling sounds like the idle control motor/valve to me especially since it wont do it with it unplugged. Normally if you unplug the Idle Valve, the engine should die, or be close to dying. A sticking one will cause random high idles, random engine stalling, or even sometimes a lower-rougher idle if you unplug it.
My truck does all of that, I've been fighting with the Idle Valve for a long times, I've cleaned it at least 5 times so far, and its only helps a little bit. I may just bite the bullet and buy a new one.
My truck does all of that, I've been fighting with the Idle Valve for a long times, I've cleaned it at least 5 times so far, and its only helps a little bit. I may just bite the bullet and buy a new one.
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ECT is the Engine Coolant Temperature sensor. This is just to the passenger side of the coolant inlet on the intake manifold. If it malfunctions it tells the brain that the engine is cold and activates the warm up features, IAC, higher idle, etc. If it has an intermittent problem, check the plug to the ECT. I had one go bad and it took a while to throw a code on that.
I have an '88 without the EGR so I can't comment on that, however it makes sense that a clean, opeerating one would be the ideal situation.
Good Luck
Rich
I have an '88 without the EGR so I can't comment on that, however it makes sense that a clean, opeerating one would be the ideal situation.
Good Luck
Rich