This is for a 1989 740GL with 108,000 miles.

I have been tracing a "check engine" problem for a while now and have been through the FAQ and am lost at this time.

The codes that are coming up are:
231- too lean: air leaks, low fuel pressure, bad sensor
221- Lean; air leak; low fuel pressure; bad AMM
213- Wiring fault to TPS or TPS failure
232- If too rich: high fuel press., leaking injector

I have changed out the AMM and verified that it is functioning properly.
New plugs an wires.
I have cleaned out the throttle body...
I have changed out and adjusted the TPS.
Checked Fuel Regulator.

When I clear the codes I get the same ones back in an instant but if I clear the codes and leave the TPS unplugged I do not get any codes. I have replaced the TPS and think the switch is OK and adjusted properly. What should I be doing next?

Thanks

Since it sounds like you have it narrowed down to the TPS.

"When I clear the codes I get the same ones back in an instant but if I clear the codes and leave the TPS unplugged I do not get any codes"

Pull the connector, and look down at the female ends. The connectors that volvo uses sometimes the pin pushes itself back and doesn't make good contact. I would also check the wiring to the TPS.
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excellent call Al
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'92 740 B230F Wagon::'92 B230F 240::'86 B230FT Wagon (RIP-Parts Car):'83 320I::'79 320I::'81 320I::'74 2002::'70 Torino GT Convertible(351C)::1970 Dodge Dart GT 340::'70 Monte Carlo::1979 Dodge Tradesman B300 Custom(360)::'84 SAAB 900S::2004 Dodge Dakota

Hi Guys,

I did notice on the female connector on the TPS plug #2/black was bent out of shape. It seemed to look like it was still making contact with the pin so until I replace or repair I wint know if thats the cause.

I will post ASAP to let you know if it was the source of the problem.

Thanks

You can take a small screwdriver(jewelers type) and reach in and release the pin and pull it completely out the back. Rebend the holding pins and reinsert. This happens frequently on these connectors.
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Post Back. That's whats makes this forum work.