1996 with a rough idle
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Senior User
Joined: Oct 2006
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1996 with a rough idle
I have a 1996 with a rough idle. To me when I am standing by the exhaust it pops like a gasoline engine with a burnt valve. Normal? Runs out strong and gets 20 mpg when I drive with my big toe and not my big fat foot! But it idles rough.
Thanks,
Justin
Thanks,
Justin
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Is the check engine light on?
Might want to Have it scanned anyway.
How old is the engine oil. These engines are very touchy about oil level and quality.
If it's getting close to 'Oil Change Time' then do it.
Same goes for fuel filter.
Might want to Have it scanned anyway.
How old is the engine oil. These engines are very touchy about oil level and quality.
If it's getting close to 'Oil Change Time' then do it.
Same goes for fuel filter.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
That's great, hopefully it won't return. Sometimes the PCM is just confused.
BTW: Try pulling #22 & #9 fuses under the hood to reset the PCM.
Doesn't always work but it's an easy to do.
7.4 ?? Your engine has grown by .1 L
Sorry had to do it
You can get it scanned a some Autozones for free.
BTW: Try pulling #22 & #9 fuses under the hood to reset the PCM.
Doesn't always work but it's an easy to do.
7.4 ?? Your engine has grown by .1 L
Sorry had to do it
You can get it scanned a some Autozones for free.
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Rough idle continues but only when it warms up. Smooth as a pair of silk panty hose when cold but lopes when it gets warm. Sounds like it's running on 7 1/2 cyl until you get it out on the road then it smooths right out. Anything above 1200 RPM runs smooth.
New air filter, oil change has 1,000 miles on it. Fuel filter has about the same as the oil.
Ideas?
Thanks,
Justin
New air filter, oil change has 1,000 miles on it. Fuel filter has about the same as the oil.
Ideas?
Thanks,
Justin
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Posting Guru
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From: THUNDER BAY
Hi Justin just curios have you changed your injector o rings? or are they original just wondering because my 96 is in need of injector o rings and mine does exactly what yours is doing even more now since I put in a 203 stat just a suggestion it may not be you problem.
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Postmaster
Joined: Sep 2007
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From: Medford Oregon
Rough idle continues but only when it warms up. Smooth as a pair of silk panty hose when cold but lopes when it gets warm. Sounds like it's running on 7 1/2 cyl until you get it out on the road then it smooths right out. Anything above 1200 RPM runs smooth.
New air filter, oil change has 1,000 miles on it. Fuel filter has about the same as the oil.
Ideas?
Thanks,
Justin
New air filter, oil change has 1,000 miles on it. Fuel filter has about the same as the oil.
Ideas?
Thanks,
Justin
Diesel-Central.com the technical source for Diesel Truck information, Truck Pulling, and Drag Racing
I learned a lot reading this but don't know if it's pertaining to your issue. I'm sure my turn is coming.
Tuned
Joined: Feb 2005
Posts: 380
Likes: 1
From: ohio
My 7 1/2 cylinder problem was slightly different than yours but I had rough idle too. Two things to check. Check your fuel pressure at the schrader valve with a gauge. Mine was doing the bounce routine that comes from a shot fuel pump, thats where my miss was coming from. 2 cycle oil in the fuel has made a real differance in smoothness and noise in mine. Split a quart of outboard oil between your tanks at next fuel up. The results came very quick in mine and I run it all the time now. If it works for you do some shopping and buy it in bulk to save a bunch.
Lead Driver
Joined: May 2007
Posts: 8,608
Likes: 13
From: Belair md
while getting it scanned ask them to moniter ipr duty cycle cold through warm up. you need to see what the ipr is commanded to, to see if you have an oil leak developing at hot oil temps. could be as simple as an ipr o-ring up to injector o-rings.
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