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  #1  
Old 04-17-2011, 06:06 PM
fadetoblack86 fadetoblack86 is offline
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Join Date: Apr 2011
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Default 90 rough idle during cold start

so basically when i start my truck from a cold start it revs up then just falls and dies. i usually have to start it like 5 times with the foot on the accelerator for 5 mins to warm it up, then it idles a little roughly (not too horrible). it also hiccups a lot during low cruising in 1st, 2nd gears unless i'm accelerating, but not in the higher gears. once it's running and warm it runs fine despite hiccuping while i'm barely accelerating in low gears.

i've changed my air filter, fuel filter, pcv valve, added injector cleaner, gonna have my friend help me change my spark plugs tomorrow and check my codes, cleaned out my IAC, battery and alternator are in good shape, no C/E light, and so far nothing has worked. i'm just wondering if any of you guys have any other ideas what it could be before i take it in to have it looked at. i've heard it could be the fuel pressure line or vacuum hose.

any thoughts and or help?

thanks

Last edited by fadetoblack86; 04-17-2011 at 06:11 PM.
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  #2  
Old 04-17-2011, 06:22 PM
More_Cowbell More_Cowbell is offline
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Default Re: 90 rough idle during cold start

adjust your idler screw and see if that helps it should be on the throttle body near where the throttle cable hooks up to the body itself
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1990 Ranger Extended Cab
2.9L V6 5 Speed Transmission
Planning to put a 347 and a T-5 in it eventually

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It looks like someone attacked the front of the truck with a bedazzler.
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  #3  
Old 04-17-2011, 10:42 PM
fadetoblack86 fadetoblack86 is offline
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Default Re: 90 rough idle during cold start

yeah i've tried that too. after looking through the forums it seems like it would be the fuel pump
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  #4  
Old 04-18-2011, 12:10 PM
Psychopete Psychopete is offline
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Default Re: 90 rough idle during cold start

Sounds like checking fuel pressure when running and checking vacuum are good places to start! Pulling codes is also good for reference, might not hold the answer, but sure can get you closer to it.
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  #5  
Old 05-05-2011, 05:34 AM
RMZpilot RMZpilot is offline
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Default Re: 90 rough idle during cold start

Mine started hard starting, rough idle. Like the choke doesnt know wth its doing. Coughs and will die when starting without giving it a little pedal cold or hot, then idles around 600rpm a little rough but steady (s/b closer to 800 correct). Mileage took a crap and it smells rich to me. Ill adjust the idle screw to get the rpm up a bit and see if that helps.

It seems like the choke/computer is getting bad data from something but no codes as of yet. If it keeps getting worse it will eventually toss a code?
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  #6  
Old 05-06-2011, 10:09 PM
fadetoblack86 fadetoblack86 is offline
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Default Re: 90 rough idle during cold start

so i found out it was the maf sensor. it was fried so had to get a new, but now it runs like a charm! thanks for all the input and help guys!
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