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Old 02-12-2010, 05:50 PM   #1
Hanster
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Default 2.9 Problems - runs rough when warmed up

I have 1986 Ranger 2.9L 4x4 manual. Recently after the engine has been running for a little bit it slowly progress's to barely running at all. When its cold I can do what ever I want, it runs really strong. Accelerates normal. But when warm it struggles to get above certain rpm's until barely running at all. Then after cooling completely down it runs really good for a certain amount of time. I'm stuck on what it could be and I don't really want to put the money into a mechanic fixing it.

A month ago it had running problems which turned out to be a faulty fuel pressure regulator. It was pushing 120psi. I've had that fixed now and now this is happening. The dealership also mentioned my egr needed a looking at, but could be giving false numbers because of the fuel pressure regulator. So I just had the regulator replaced. It ran good for a while until now.

I have within a year replaced the spark plugs, wires, cap and rotor, air filter.

I change the oil regularly.

I have noticed that the temp gauge never gets up to regular operating temperatures recently. I've also been getting lower than usual mpg's, i get near 14 right now and I used to be at 22-23.

And one of my recent drives when it acted up, for some reason I decided to look under the truck and my catalytic converter was glowing red hot. So that is working overtime, correct? I'm running extra rich? Might explain my recent mpg's.

I've leaning towards egr or a temperature sensor. Or maybe something with ignition because it has issues getting to higher rpm's when warm. Or a ground somewhere. Or maybe a cat conv that melted down. Or the fuel pressure regulator was misdiagnosed or installed wrong.

Any kind of incite would help a lot. Thank you.
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Old 02-12-2010, 08:41 PM   #2
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Did you say that you're cat was glowing red? When did you see this, after a long ride? Thats a definite sign of a clogged cat. Hate to say it man, because they are expensive.

But..if that doesnt help you, it sounds very much like a engine coolant sensor too. The sensor is cheap so if the cats do not totally fix you, hopefully that will

If you are running cool, thats most likely a thermostat thats stuck open. When I bought my truck, it did this. I changed the thermostat and found that the old one was stuck open...therefore making it run cool. If your truck is running cold then it'll give you crappy mileage.

Last edited by jhammel85; 02-12-2010 at 08:44 PM.
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Old 02-13-2010, 02:01 AM   #3
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Check those, but it could also be the oxygen sensor too....in my case it was...
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Old 02-13-2010, 02:16 AM   #4
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Read through this. I know there are a LOT of posts, but it is my attempt to work through the same issues (minus the red hot cats). http://www.therangerstation.com/foru...ad.php?t=68618

Anyway, do your research in the tech pages and start testing all off your sensors. You can usually test for voltage and resistance to find out if something is out of wack. Make sure your timing is where it needs to be. I agree, though, that you are probably looking, at the least, at needing new O2 sensor(s) and by now probably cats.
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Old 02-13-2010, 02:22 AM   #5
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Check your compression and vacuum as well. Too much internal oil leakage can wreak havoc also.
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Old 02-13-2010, 02:29 AM   #6
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and you don't want to replace the cats if you have underlying problems that will clog them again.
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Old 02-13-2010, 06:16 AM   #7
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depending on your state if you have to do emmisions testing just rip the cats off
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Old 02-14-2010, 02:35 PM   #8
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Thanks for the responses. I don't think my cat conv is the problem because everything is fine until the engine gets warm. Unless when the cat gets warmer it clogs, then unclogs when it cools down. But if it is the cat there is no way im replacing it, I would probably just take it off, they are really expensive. Mainly it means I'm running rich.

A while ago I tried replacing my o2 sensor and couldn't get it off.

Do you know where I can get table of resistance and voltage values of senors?

I'm trying to get my hands on a analog voltmeter so I can check codes on the computer. I only have a digital one. I can do that right?

I'm just really stumped on this because it runs good cold then bad warm. something that effects a warmed up engine.
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Old 02-14-2010, 05:49 PM   #9
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you will get bad millage too if its not fully warming up
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Old 02-14-2010, 05:56 PM   #10
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just get a test light. They are cheaper. Unless of course you need an analog voltmeter.

This has some of the sensor values. http://www.broncoii.org/techpages/ee...ng:%20%2811%29
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