Few questions for you. 93 Bonneville. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-20-2004, 11:23 PM   #11
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your 93 only has one o2 and that is on the downpipe. could o2 just be bad?
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Old 12-21-2004, 12:35 AM   #12
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Quote:
Originally Posted by 1993 SLE
your 93 only has one o2 and that is on the downpipe. could o2 just be bad?
Oxygen sensors run rich when they go to the downpipe in the sky, it'* much safer for an engine.Otherwise a lot of poor maintained motors would be overheating like crap. That'* why you lose milage.

Sounds like your IAC is dirty, it'* one of the parts of the TB. Only hard part is one of hte bolts that'* on the bottom, the crossover pipe is in the way.
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Old 12-21-2004, 01:51 AM   #13
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DTC 44 6E3-A-86:

DTC 44 is set when the O2S signal voltage on CKT 412:
Remains below .25 volt for up to 4.5 minutes
The system is operating in "Closed Loop"

Diagnostic Aids:

Using the Tech 1, observe the long term fuel trim values at different RPM and air flow conditions. The Tech 1 also displays the fuel trim cells, so the long term fuel trim values can be checked in each of the cells to determine when the DTC 44 may have been set, If the conditions for DTC 44 exist, the long term fuel trim values will be around 150 or greater.

Oxygen Sensor Wire Sensor pigtail may be mispositioned and contacting the exhaust manifold.

Check for intermittent ground in wire between connetor and sensor.

Poor PCM to engine block ground.

MAF Sensor A Mass Air Flow (MAF) sensor output that causes the PCM to sense a lower than normal airflow will cause the system to go lean. Disconnect the MAF sensor. If the lean condition id gone, replace the MAF sensor.

Lean Injector(*) Perform injector balance test CHART C-2A

Fuel Contamination Water, even in small amounts, near the in-tank fuel pump inlet can be delivered the the injectors. The water causes a lean exhaust and can set DTC 44.

Fuel Pressure System will be lean if pressure is too low. It may be necessary to monitor fuel pressure while driving the vehicle at carious road speeds and/or loads to confirm. See "Fuel System Diagnosis," Chart A-7

Exhaust Leaks If there is an exhaust leak, the engine can cause outside air to be pulled into the exhausr past the sensor.

Vacuum or Crankcase Leaks can cause a lean condition and/or possibly a high idle.

If the above are OK, it is a faulty sensor.
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Old 12-21-2004, 11:15 AM   #14
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Thanks a ton Damemorder for the information. I unfortunetly do not have access to a tech on to observe the car while under load. I may have a friend with one but I would not be able to do anything for a while. I do not have a fuel pressure guage otherwise that would be the first thing I would hook up. It looks to me as though I am going to have to clean the TB and then hold off on the other things until I have time.
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