idles bad until engine warms up - Ford Ranger Forum

teemgreen99 · 08-26-2011, 09:45 PM

I have a 1987 ford ranger 2.3 gas 5 speed manual and the idle fluctuates when I first turn it on until engine is warm even to the point that it will die sometimes, the idle goes high low steadily until it dies or warms up then it runs just fine. Any ideas I replaced the IAC and changed some vacuum lines off the map sensor that looked cracked and warn also replaced the pcv valve.

**Hurley** · 08-26-2011, 11:01 PM

Check engine light on?

teemgreen99 · 08-27-2011, 10:20 PM

no check engine light, only thing i could think of is the Map sensor

**Hurley** · 08-27-2011, 10:42 PM

Might be your egr valve

C Denny Run* · 09-02-2011, 03:34 PM

I'm positive it has something to do with vacuum. Have you used brake clean, or anything to check for leaks? I had the same problem with my 2.9, and it turned out to be a vacuum clog. Clogs can give the same symptoms as a leak. I had to take my whole intake system apart, and do a super clean. Fixed it right up

Regards

-Denny

C Denny Run* · 09-02-2011, 03:39 PM

Oh, and by the way, the check engine light doesn't have to be on, for it to throw a code. It could have a code stored in it. Sometimes the CEL flashed briefly, and you don't even see it. Also, it could have a burned out bulb. When you first turn your key forward, does the CEL flash? That's one way to tell.

I didn't have a CEL on, but I had three friggen codes stored! Might want to check anyway. I bought a OBD1 code reader off ebay, for like $15 (new) Totally worth it!

08-26-2011, 09:45 PM	#1
teemgreen99 Junior Member Join Date: Aug 2011 Posts: 17	idles bad until engine warms up I have a 1987 ford ranger 2.3 gas 5 speed manual and the idle fluctuates when I first turn it on until engine is warm even to the point that it will die sometimes, the idle goes high low steadily until it dies or warms up then it runs just fine. Any ideas I replaced the IAC and changed some vacuum lines off the map sensor that looked cracked and warn also replaced the pcv valve.

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08-27-2011, 10:20 PM	#3
teemgreen99 Junior Member Join Date: Aug 2011 Posts: 17	no check engine light, only thing i could think of is the Map sensor

09-02-2011, 03:34 PM	#5
C Denny Run* Junior Member Join Date: Aug 2011 Posts: 26	I'm positive it has something to do with vacuum. Have you used brake clean, or anything to check for leaks? I had the same problem with my 2.9, and it turned out to be a vacuum clog. Clogs can give the same symptoms as a leak. I had to take my whole intake system apart, and do a super clean. Fixed it right up Regards -Denny

09-02-2011, 03:39 PM	#6
C Denny Run* Junior Member Join Date: Aug 2011 Posts: 26	Oh, and by the way, the check engine light doesn't have to be on, for it to throw a code. It could have a code stored in it. Sometimes the CEL flashed briefly, and you don't even see it. Also, it could have a burned out bulb. When you first turn your key forward, does the CEL flash? That's one way to tell. I didn't have a CEL on, but I had three friggen codes stored! Might want to check anyway. I bought a OBD1 code reader off ebay, for like $15 (new) Totally worth it!