Thread: Odd loss of power?

Is it happening on petrol or gas or both ?
If it is gas id suggest check to see if your gas converter is freezing up due to a coolant air lock maybe

Originally Posted by rangieman

Is it happening on petrol or gas or both ?
If it is gas id suggest check to see if your gas converter is freezing up due to a coolant air lock maybe

Sorry mate should have stated that.
It happens on both gas and petrol. The converter is not freezing, i checked that. 100% sure.

Just had a shower. (do my best thinking in the shower)
Thinking now it is a really strong possibility its the TPS. If the TPS fails to read my throttle the ecu will go to idle yea?
Its not cutting out like if spark was lost, rather like the accelerator cable snapped.

Yea really thinking the connection to the TPS was not made properly and its briefly throwing an error and causing it.

No a 14CUX will run fine without a tps, but not have injector cutoff at 1500 rpm, and may not be as crisp in acceleration as is only using the MAF to sense load.
i should qualify as mine also had O2 sensors.

regards Philip A

Originally Posted by PhilipA

No a 14CUX will run fine without a tps, but not have injector cutoff at 1500 rpm, and may not be as crisp in acceleration as is only using the MAF to sense load.
i should qualify as mine also had O2 sensors.

regards Philip A

Damn rules the easy one out.

Do you have any time delay relays in the system like to change from petrol to gas..?

also I didn’t get about the stepper. AFAIR they have 1 vacuum tap for the fuel pressure regulator. Is the other tap for gas.
gas diagnosis is always hard as the setups vary.
regards Philip A

Originally Posted by PhilipA

Do you have any time delay relays in the system like to change from petrol to gas..?

also I didn’t get about the stepper. AFAIR they have 1 vacuum tap for the fuel pressure regulator. Is the other tap for gas.
gas diagnosis is always hard as the setups vary.
regards Philip A

There is a temperature delay for gas. Has a sensor on the gas rail.

Yes the stepper housing i put on has a second tap for the gas basically.
Hmmm i wonder if i piped that wrong some how?

I ran one pipe split in 2. One to the fuel regulator and one to the heater thing.
I ran a second pipe split in 2. One to the gas diafram and the other to the gas box thingamebob.
There is a box on the firewall for gas. It has a hose from the gas rail that goes to the box and vaccum also and an electrical connection. Its not a solinoid rather a square box of sorts.

gas-thingamabob.jpg Added a pic of that box. Sorry its not a better picture. Its dark outside, windy and raining quite a bit so it tested my camera abilities.
The left V is where i have the vacuum and the Gas one is off the gas rail. Third thing is the electrical plug. Hard to see in this pic.

Try unplugging the VSS and go for a drive and see what it does. Its what mine was doing, unplugged the VSS and drove fine. I thought my VSS was stuffed then I adjusted the TPS, plugged VSS back in and all good possibly a coincidence though. I know u said you ruled your TPS out but it might put you on the right path. Like you said you've installed the LPG many of times it's probably something else just to **** you!

Cheers Jim

Just hunting the web for ideas and come across this.

Engine cuts out around 1800 RPM, then resumes at 1500 RPM

Seems in this case most likely it was the TPS that caused it.

I had a couple recent PMs by people wondering if/how I fixed this problem... I ended up replacing the Throttle Position Sensor (TPS), Ignition Coil, Distributor Cap, and Alternator (in that order), since it turns out I had more than one gremlin last fall.

If I recall correctly, the TPS fixed the surging problem.... I think it was about $300, and the only test to see if it's the problem is to swap in a known-good TPS.