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 Misfire?Cat clogged? Something else?
#1019674
02/02/11 03:55 AM
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Joined: Nov 2010
Posts: 41
OP
Getting the Wheeling Fever
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So, we went wheeling today and a couple of the guys with me think the truck is running poorly. They said it is visibly smoking as well as "sounds" like it is running on 5 cylinders. I'm arguing that if it had such a bad misfire, that it would throw a code and the check engine light would come on.
I'm wondering if the catalytic converter is clogging up due to the bad valve stem seals?
On occasion it feels like it is lugging pretty bad and I do get a bit of a shudder at 40mph-ish.
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Re: Misfire?Cat clogged? Something else?
[Re: TerraXpeditions]
#1019675
02/02/11 04:05 AM
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Joined: Feb 2000
Posts: 3,269
Roll Me Over
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What vehicle, year and what are we talking here? Help us help you...
99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..
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Re: Misfire?Cat clogged? Something else?
[Re: TerraXpeditions]
#1019676
02/02/11 04:05 AM
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Joined: Jan 2001
Posts: 13,649
Web Wheeler
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Disconnect the isc plug and see if it will start and idle. If so, then pull one plug wire at a time and see if the idle speed stays the same or drops. If it stays the same, that cylinder is misfiring...
Not responsible for advice not taken...
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Re: Misfire?Cat clogged? Something else?
[Re: TerraXpeditions]
#1019677
02/02/11 04:20 AM
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Joined: Nov 2010
Posts: 41
OP
Getting the Wheeling Fever
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Sorry, 95 Montero SR 3.5... I'm used to having a signature in other forums.
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Re: Misfire?Cat clogged? Something else?
[Re: fasteddy]
#1019678
02/02/11 04:24 AM
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Joined: Nov 2010
Posts: 41
OP
Getting the Wheeling Fever
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Disconnect the isc plug and see if it will start and idle. If so, then pull one plug wire at a time and see if the idle speed stays the same or drops. If it stays the same, that cylinder is misfiring... Idle Speed Control? Wouldn't the computer throw a code if it were misfiring?
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Re: Misfire?Cat clogged? Something else?
[Re: TerraXpeditions]
#1019679
02/02/11 04:35 AM
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Joined: Feb 2000
Posts: 3,269
Roll Me Over
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Disconnect the isc plug and see if it will start and idle. If so, then pull one plug wire at a time and see if the idle speed stays the same or drops. If it stays the same, that cylinder is misfiring... Idle Speed Control? Yes Idle speed control, since we're talking 95 SR, you cant disconnect the wires while the engine is running. Wouldn't the computer throw a code if it were misfiring? Not always.. When's the last time the wires and plugs have been changed? A big job on that engine, but thats where I would start. Also Check the resistance of the coil packs while your in there.
99 Gen 2.5, fixing blown head gasket
89 SWB- 33's, ARB Front locker, SR rear locker/axle, SR F brakes, winch, WST Offroad Armor all Around, 2.85 Aussie T-case Gears (SOLD)
Sold: (2) 95 SR's, 86 SWB, 90LWB, 91 LWB
-Can Change a timing belt in my sleep..
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Re: Misfire?Cat clogged? Something else?
[Re: TerraXpeditions]
#1019680
02/02/11 05:12 AM
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Joined: Jan 2000
Posts: 16,227
Web Wheeler
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Idle Speed Control?
Wouldn't the computer throw a code if it were misfiring? My 96's pretty much dead and no check engine light.
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Re: Misfire?Cat clogged? Something else?
[Re: off-roader]
#1019681
02/02/11 05:33 AM
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Joined: Nov 2010
Posts: 41
OP
Getting the Wheeling Fever
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Idle Speed Control?
Wouldn't the computer throw a code if it were misfiring? My 96's pretty much dead and no check engine light. The tan one, Ray?????????
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Re: Misfire?Cat clogged? Something else?
[Re: TerraXpeditions]
#1019682
02/15/11 12:39 AM
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Joined: Nov 2010
Posts: 41
OP
Getting the Wheeling Fever
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Ok guys. So, I replaced the plugs. I did not replace the wires because of the difficulty. Truck ran GREAT for 3 days until today it decided to go back to misfiring.
The lugging went away and the idle was smooth when it was running properly.
How do I test the coils as mentioned above?
And where in the FSM is the Idle Speed Control plugs?
Looking up plug wires now... I'll also need the intake plenum gasket because it will be removed, correct?
If anyone is willing to call to help me, three 1 eight- 7 nine four 33 six two.
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Re: Misfire?Cat clogged? Something else?
[Re: TerraXpeditions]
#1019683
02/15/11 01:08 AM
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Joined: Jan 2000
Posts: 16,227
Web Wheeler
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Idle Speed Control?
Wouldn't the computer throw a code if it were misfiring? My 96's pretty much dead and no check engine light. The tan one, Ray????????? Yup, the tan one. ISC was completely dead. Put a new ISC in and presto cablamo, works like a champ and idles normally now (high until warmed up) when cold. Sorry to hear about the continued issues with the rough idle. I'm sure some of the guru's on here will be able to help you diagnose it. <img src="/forums/images/graemlins/kewl.gif" alt="" /> BTW, I'd be willing to bet you'll want to re-pull the plugs and post up pictures. It's possible one of them is covered in oil like before which means there's something wrong in that cylinder... but what do I know... I haven't slept in a Holiday Inn Express in years. <img src="/forums/images/graemlins/lol.gif" alt="" />
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