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  #1  
Old 01-03-2010, 07:38 PM
dherndon99 dherndon99 is offline
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Default 89 2.9l high hydrocarbons and rough high idle

1989 2.9l trying to get it to pass CA smog but hydrocarbons are high...idle is around 1000rpm (i have re timed it a bunch to 10btc) very rough but no hesitation while going up through the band and smoothes out about 1500. thought maybe missfire or a clogged injector but replaced fuel injectors, spark pugs, wires, cap rotors, EGR valve, MAP sensor. ran seafoam through it too and nothing. tired of throwing parts at it so any help would be awesome. oh and compression test passed and i do not think it could be o2 sensor because just hydrocarbons are high.
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Old 09-08-2010, 05:51 AM
malibuz16 malibuz16 is offline
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Default Re: 89 2.9l high hydrocarbons and rough high idle

Check for a leak around the intake. Spray carb cleaner around while the engine is running and listen for a change in how the engine runs. Also you could try clening your MAF (Mass Air Flow) Sensor.
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Old 09-16-2010, 08:12 PM
art47 art47 is offline
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Default Re: 89 2.9l high hydrocarbons and rough high idle

Does a 1989 have a MAF?
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  #4  
Old 10-13-2010, 12:23 PM
Cbuch Cbuch is offline
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Default Re: 89 2.9l high hydrocarbons and rough high idle

2.9L are notorious for rough idles
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  #5  
Old 10-13-2010, 02:29 PM
More_Cowbell More_Cowbell is offline
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Default Re: 89 2.9l high hydrocarbons and rough high idle

mine idles at 1k rpm and its kind of a shaky idle could just be the motor mounts are worn allowing for more movement
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1990 Ranger Extended Cab
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  #6  
Old 10-14-2010, 06:39 AM
Psychopete Psychopete is offline
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Default Re: 89 2.9l high hydrocarbons and rough high idle

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Originally Posted by art47 View Post
Does a 1989 have a MAF?
Only the later california emission models had a MAF system.
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  #7  
Old 10-14-2010, 09:51 AM
TheStig TheStig is offline
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Default Re: 89 2.9l high hydrocarbons and rough high idle

easy fix.....

get out of Kalifornistan

lol
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  #8  
Old 11-17-2010, 06:50 AM
Airborne Ranger Airborne Ranger is offline
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Default Re: 89 2.9l high hydrocarbons and rough high idle

I'm having the same problem, with my 88 of the same size. Plus I live in Washington, the emissions laws are pretty damn close to Cali's. I read somewhere that the 88 2.9 is particularly finicky about grounds. The poor guy ended up replacing just about every sensor he had just to find out a ground hadn't been reattached to the back of the block after a professional rebuild.
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Last edited by Airborne Ranger; 11-17-2010 at 06:55 AM.
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