over heating with lean codes
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New User
Joined: Sep 2012
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From: norristown
over heating with lean codes
I just bought my 'new' 96 4.9 4x4 xl a couple weeks ago. I knew it had a egr code, and secondary air code, air tube is broke, all other monitors were set. I only drive the truck about 15 miles a week and was driving fine the first 3 weeks I had it.
The other day coming home around 55-60 mph hit a bump and she stalled out. Started right up while coasting in neutral with no other issues. The next day it happened again and started to over heat. Now she has bank one and bank two lean code. As well as the other codes.
I only have a code reader and can't read the fuel trim or KAM info. Just need a nudge in the right direction to help figure out what's going on. I don't know why or if the new lean codes have to do with the over heating issue. No visual coolant leaks. And runs fine until I hit a bump while accelerating.
The other day coming home around 55-60 mph hit a bump and she stalled out. Started right up while coasting in neutral with no other issues. The next day it happened again and started to over heat. Now she has bank one and bank two lean code. As well as the other codes.
I only have a code reader and can't read the fuel trim or KAM info. Just need a nudge in the right direction to help figure out what's going on. I don't know why or if the new lean codes have to do with the over heating issue. No visual coolant leaks. And runs fine until I hit a bump while accelerating.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
Get under it look at the wires to the 02 sensor?
With it idling wiggle sections of the harness, see if you can find a "tender spot" part of the harness where you get a definite reaction to shaking the wires around.
If find one you know where to concentrate your efforts. If has no effect might be something little more drastic.
Oh and make sure the battery is tied down/isn't too tall for truck, positive post isn't hitting hood when hitting bumps in road.
Give the whole thing good visual going over, make sure no fuses are blown etc etc.
With it idling wiggle sections of the harness, see if you can find a "tender spot" part of the harness where you get a definite reaction to shaking the wires around.
If find one you know where to concentrate your efforts. If has no effect might be something little more drastic.
Oh and make sure the battery is tied down/isn't too tall for truck, positive post isn't hitting hood when hitting bumps in road.
Give the whole thing good visual going over, make sure no fuses are blown etc etc.
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New User
Joined: Sep 2012
Posts: 6
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From: norristown
I didn't even think of the battery. I noticed it was missing the hold down when I bought it and thought it could wait till I fixed the exhaust.
Awesome, thanks for you input. Any insight into the lean codes and over heating issue?
I'm gonna fasten the correct battery in the truck n clear the codes n see what happens. I read that the truck could run over heat with lean codes. I gonna try to find a scanner that will read the MAS, but until I can I just bought some $30 cleaner and plan on cleaning this weekend. I also looked for vacuum leaks and haven't found any. Sprayed everything down w carb cleaner and no change in idol. The PCV valve, grommet, and hose are new. The throttle body and intake gaskets don't appear to have any leaks.
I appreciate the feed back.
Awesome, thanks for you input. Any insight into the lean codes and over heating issue?
I'm gonna fasten the correct battery in the truck n clear the codes n see what happens. I read that the truck could run over heat with lean codes. I gonna try to find a scanner that will read the MAS, but until I can I just bought some $30 cleaner and plan on cleaning this weekend. I also looked for vacuum leaks and haven't found any. Sprayed everything down w carb cleaner and no change in idol. The PCV valve, grommet, and hose are new. The throttle body and intake gaskets don't appear to have any leaks.
I appreciate the feed back.
Senior User
Joined: Jun 2011
Posts: 382
Likes: 0
From: Milford, CT
Your lean problem is your overheating problem. Things to check:
1) Electrical. (like danr1 said) This is all the sensors and wiring, but focus on the O2 sensor, MAF, and wiring. Also check your ECT sensor.
2) Fuel pressure. The computer times injection pulses based on a (roughly) known pressure, too little pressure=too little fuel
3) Firing order/timing/valves. Probably not this, but could cause your symptoms. Ignore this till you rule out everything else.
You seem to have a global problem, and given your configuration I would not suspect the Injectors/associated wiring. First off, make sure all your sensors are plugged in, then try the shake test danr1 suggested, then pop a gauge on your fuel rail and clean your MAF. Do you know how old the HEGO (O2 sensor) is?
-Mike
1) Electrical. (like danr1 said) This is all the sensors and wiring, but focus on the O2 sensor, MAF, and wiring. Also check your ECT sensor.
2) Fuel pressure. The computer times injection pulses based on a (roughly) known pressure, too little pressure=too little fuel
3) Firing order/timing/valves. Probably not this, but could cause your symptoms. Ignore this till you rule out everything else.
You seem to have a global problem, and given your configuration I would not suspect the Injectors/associated wiring. First off, make sure all your sensors are plugged in, then try the shake test danr1 suggested, then pop a gauge on your fuel rail and clean your MAF. Do you know how old the HEGO (O2 sensor) is?
-Mike
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