wits end

rover4x4

rover4x4

Well-known member
Apr 21, 2004
5,231
49
41
North Carolina, Raleigh
I had a loose PS O2 sensor. I didn't discover this untill yesterday. I drove the truck 300 miles thursday and got the code 44. Tightened the o2 sensor, cleaned codes ran some errands. Running like shit again, code 44 again. Swapped the O2 sensor out for a known good sensor, put the sensor that was throwing the code in a 4.2 drove it around for 30 minutes. No codes in the LWB with my O2 sensor, still getting #44 with the "good" sensor from the LWB. I did my best at testing the plug that the O2 plugs into, I got roughly the same values between the plug on my SWB and the LWB. I am not sure what else there is to do. Ive done everything short of checking fuel pressure. The ignition module has not been relocated from the distributor, I have not had any issues up until the arrival of the warmer weather. Truck has all new ignition components, a new TPS and I cleaned the MAF last weekend. 1181xx miles. The truck idles terrbile almost to the ploint of stalling out. Runs good on the road plenty of power etc, so it seems its getting fuel and ignition. It will intermittently loose power in town and low speeds. Does this truck have a VSS, I am unclear on what that does. Thanks for any insight, I have run out of ideas and the RAVE hasn't helped.






Anyone think an alternator could cause all this?

I might have a 91 Hunter for sale soon.
 
Ren Ching

Ren Ching

Well-known member
Nov 23, 2007
288
2
Washington DC
probably wishful thinking but maybe plugs fouled by rich condition caused by o2 sensor "issue"?

did you check the voltage on the heater side of the sensor with the ignition on? (i think that was the test anyway, amazing how fast these things leave my memory now that the rr is gone)

you can push the multimeter probes into the back of the plug to test voltage while it is plugged in.


rover4x4 said:
catalytic converter?
Click to expand...
 
rover4x4

rover4x4

Well-known member
Apr 21, 2004
5,231
49
41
North Carolina, Raleigh
Ren Ching said:
probably wishful thinking but maybe plugs fouled by rich condition caused by o2 sensor "issue"?

did you check the voltage on the heater side of the sensor with the ignition on? (i think that was the test anyway, amazing how fast these things leave my memory now that the rr is gone)

you can push the multimeter probes into the back of the plug to test voltage while it is plugged in.
Click to expand...


A plug may be fouled, I know that the cat it rattling pretty bad so among other things, I will hopefully get the cats replaced today check the plugs and everything will be jiggy. Otherwise Im getting rid of this thing.
 
rover4x4

rover4x4

Well-known member
Apr 21, 2004
5,231
49
41
North Carolina, Raleigh
low was 149 and highest was 152 "wet", with the exception of those two the rest were 150... Thats a relief to me so I might keep the truck now. Checked the plugs and gapped them. cleaned the intake plenum, made a oring for the air intake can. replace the ds O2 sensor. Runs smoother but still has a little lumpiness. I am trying a few rounds of techron, I think it might be an injector. I doubt techron will do anything Ive been using shell or BP 93 since I got the truck. Go for a drive get code 45 for the other O2 sensor. Alternator is good replace fuel filter, the plugs did look like they were running a little lean, Champion plugs, suspect Magnacor wires. 118xxx miles.

O yeah thumbs up up for the 2" magnaflow cats and muffler.
 
D

discostew

Well-known member
Sep 14, 2010
7,745
1,026
Northern Illinois
ptschram said:
Look to the idle air control valve and TPS. Both will cause problems with idle.
Click to expand...



I agree , and if the minimum idle is messed up then I would check that the idle stop screw isn't backing out of the upper plenum . Chk for vac.leaks with a can of brake clean . You probably don't have an o2 sensor issue since you have switched them out and have the same problem.
 
Nomar

Nomar

Well-known member
Apr 23, 2004
6,078
13
Virginia
Phillip have you tried swapping out the ECU?

My Hunter had bad traces on the motherboard.



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