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Old 05-03-2013, 01:17 PM   #1
dclegg61
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98 rodeo - engine speed drops to idle while driving

have a 98 rodeo, with a V6 & Auto trans. have an intermittent problem - as I am driving engine will occasionally drop to idle speed and then pick back up to driving speed. Engine keeps running smoothly, just at idle speed.

CEL does not come on / no codes
Replaced Throttle Position Sensor - and thought I had found the problem, but since it is so random, it just didn't happen again for 1 1/2 weeks.

Anyone else have this issue?
Suggestions?
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Old 05-03-2013, 10:22 PM   #2
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Re: 98 rodeo - engine speed drops to idle while driving

very odd since the throttle is just an old cable style ...
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Old 05-04-2013, 04:17 PM   #3
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Re: 98 rodeo - engine speed drops to idle while driving

"very odd since the throttle is just an old cable style ..."

That is what I thought, Amigo-2k. That is why I thought maybe the TPS was not reading the open throttle and not telling the computer to give it more gas. But, apparently I was wrong. lol
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Old 05-12-2013, 09:21 PM   #4
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Re: 98 rodeo - engine speed drops to idle while driving

Update
I cleaned the Mass Air Flow sensor & replaced the fuel filter.
Still no solution....
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Old 05-15-2013, 10:55 AM   #5
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Re: 98 rodeo - engine speed drops to idle while driving

clogged converters??
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Old 05-15-2013, 03:06 PM   #6
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Re: 98 rodeo - engine speed drops to idle while driving

Quote:
Originally Posted by WhiteRodeo4x4 View Post
clogged converters??
Ooooo.... that doesn't sound good. Is there a way to tell for sure without replacing them? Do any of the Catalytic Converter cleaners really work?


ALSO, I checked the fuel pressure at the fuel rail. 50psi with vacuum hose disconnected from fuel pressure regulator. 37psi with vacuum hose connected. Pressure regulator was replaced just over a year ago.
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Old 05-15-2013, 04:55 PM   #7
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Re: 98 rodeo - engine speed drops to idle while driving

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Originally Posted by dclegg61 View Post
Ooooo.... that doesn't sound good. Is there a way to tell for sure without replacing them? Do any of the Catalytic Converter cleaners really work?


ALSO, I checked the fuel pressure at the fuel rail. 50psi with vacuum hose disconnected from fuel pressure regulator. 37psi with vacuum hose connected. Pressure regulator was replaced just over a year ago.

I actually took mine to Mineke Muffler and they checked it for free. The can check the back pressure. Mine had a left clogged converter and it would slow down to 40 mph on a hill. You could also hear a louder noise coming from the air box (air filter housing) when giving it the gas.
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Old 05-16-2013, 08:15 AM   #8
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Re: 98 rodeo - engine speed drops to idle while driving

Thanks, I'll give that a check.
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