bogging, smelling gas??
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Freshman User
Joined: Apr 2007
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bogging, smelling gas??
well im going to try this again, see if it gets any respons'.
i have an 88 B2 2.9L 4x4...
so shes finally been running pretty good lately w/o any problems.
heres one small problem im having tho.
say i hop in and start the ride, it fires up so quick, i drive off, say im sitting at a light and im idling at around 1000 my idle drops to abour 500 and it starts to cough, then i rev it a bit and it goes away. it does this quite frequently and when it happens it starts to smell like gas. my cap, rotor, plugs, wires, coil have all been changed, as well as all my fuel filters, and my FPR. any suggestions?
i have an 88 B2 2.9L 4x4...
so shes finally been running pretty good lately w/o any problems.
heres one small problem im having tho.
say i hop in and start the ride, it fires up so quick, i drive off, say im sitting at a light and im idling at around 1000 my idle drops to abour 500 and it starts to cough, then i rev it a bit and it goes away. it does this quite frequently and when it happens it starts to smell like gas. my cap, rotor, plugs, wires, coil have all been changed, as well as all my fuel filters, and my FPR. any suggestions?
Posting Guru
Joined: Sep 2004
Posts: 1,915
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From: Yokosuka, Honshu, Japan
You have two canisters, one on the driver's side just behind the radiator core support at the bottom that has a couple of hoses going to it and then another that is back by the tank. If I'm not mistaken, they're to contain the evaporating gasoline vapors from the tank and they're supposed to purge automatically via vacuum, but eventually you have to replace them. The other issue is probably your Idle Air Control. It probably needs a good cleaning at the very least along with your upper intake and throttle body. You should check your fuel pressure -- they have gauges at most any auto parts store -- as well as pull codes.
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so this evap system could cause this?? even tho its just vapors or... ill try pulling codes, but i know there will be alot more then just that one...how are ways of cleaning the IAC and the upper intake?..i should have a spare IAC...how bout the o2 sensor...
Postmaster
Joined: Dec 2001
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From: UT
If the EVAP system gets plugged up (or the valve doesn't open in applications that have a CANP valve), then the charcoal cannister never gets purged and can get saturated with gasoline, and then you smell it.
Why do you think there will be a lot of codes? My '87 BII only gave pass codes unless something was wrong. Because the computer's job is all about fuel mixture management, any trouble the computer is seeing could cause it to run rich, and you'd smell gas. The O2 sensor is part of the engine management system, so the best place to start diagnosing it is to pull codes from the computer to see if the computer can/has seen a problem with it.
Why do you think there will be a lot of codes? My '87 BII only gave pass codes unless something was wrong. Because the computer's job is all about fuel mixture management, any trouble the computer is seeing could cause it to run rich, and you'd smell gas. The O2 sensor is part of the engine management system, so the best place to start diagnosing it is to pull codes from the computer to see if the computer can/has seen a problem with it.
Posting Guru
Joined: Sep 2004
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From: Yokosuka, Honshu, Japan
I had an EVAP canister (aka carbon canister) that was so full of vapor on one of my previous vehicles that we ended up having to replace it. Your O2 sensor could be throwing bad info to the computer causing a rich condition as well. Sometimes it'll result in a code, sometimes not. Cleaning the upper intake and IAC can be done with the spray carb/throttle body cleaner and it's best to remove all of that from the engine to do so. You can use the nylon bristle brushes and pipe cleaners on the upper intake and throttle body, but the IAC may require a small toothbrush/wire brush.
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ill give the throttle body, and IAC a cleaning this weekend hopefully...i just added a can of SEAFOAM and gonna see how that works aswell
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