H80XM 3.4 Stalling - Maintenance & Troubleshooting discussion in Forkliftaction's forums

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H80XM 3.4 Stalling

Trying to diagnose our lift truck! GM 3.4 liter When pressing on gas, the pedal moves almost halfway before engine revs. It does not gradually increase engine speed. I tested the voltage of the tps and its reading 1.2 volts at idle and gradually increases while pushing pedal. No spikes or drops in voltage, so I would say the tps is good. Any ideas? Can codes or sensors be monitored with a standard automotive scanner?

Posted 12 Apr 2013 01:06
By chad_r
joined 12 Apr'13 - 1 message
Indiana, United States

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I'm a little behind on this one but if you haven't fixed it yet, here are some things. First, it is a 4.3 litre engine, probably typo but you never know. This truck has a tps(throttle position sensor), and pedal position sensor(pedal position sensor). Either can cause this problem. Also the throttle body can be damaged. There were several year models when the throttle body had issues. As far as I know, a regular scanner won't hook up to this system. Hope that helps.

Posted 27 Apr 2013 12:58
By meliftman
joined 31 Jan'12 - 209 messages
Alabama, United States

Liftman
Retired
Elberta, Al.

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