Auto Shifting Issues, shifting way too low, wont kick overdrive

[Neesmo31]

Hey all, bacially car has been running fine, but all of a sudden the auto is playing up a bit. Symptoms:

In D with overdrive on, car will change 1st, 2nd, 3rd into 4th at about 35km/h - way too low, and by the time it hits 4th its bogging soo bad that you dont go anywhere.

When the car is bogging down, you hold it flat, and it wont kick down either.

Lastly, no overdrive on the highway even at 110 - 120km/h.

It will shift fine through 1-2 2-3 3-4 manually.

TPS???



Thank you everyone in advance.

[threedogs]

Can't be related but when fitting DAWES to control boost, I was not happy with the way it was shifting,[similar to yours]
After adjusting boost and needle valve it seemed to sort it out. It shifts fine now, No idea how the two are related but it
was very frustrating at the time. What are you driving???
Are you blowing heaps of black smoke???
Maybe a hose has split or come loose from the intercooler? remove engine cover to check

[taslucas]

Yep I'd check TPS first. Those are definite symptoms of a faulty TPS.

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[patch697]

X3 on the TPS

[taslucas]

Pull plug off TPS and give a good clean inside. Make sure contacts are clean etc etc. Check where the shaft goes into the TPS and make sure it turns freely and is clean etc.

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[threedogs]

Just read archives thread from Toecutter, same problem
TPS cost from Mr Nissan $500, he managed to fix his for zip
very similar to cleaning the MAF sensor .worth a read if anyone could put thread here

[Neesmo31]

Should of clarified, its a TB42EFI, sorry. All the plugs seem fine and my tuner has said that it probably is the TPS as well. I can get another TPS for the TB42EFI (with auto) for $149. Only thing is that I may have to get a computer sorted to recalibrate the ECU TPS as its running a Haltech.

Plugs are in good nick though, I smash dielectric grease on every connector I possibly can. Will test the TPS tonight, clean and advise on the results. Thanks everyone so far.

[taslucas]

Just read archives thread from Toecutter, same problem
TPS cost from Mr Nissan $500, he managed to fix his for zip
very similar to cleaning the MAF sensor .worth a read if anyone could put thread here

Wow, $500??? I wonder how different the price is between efi and carby models. Mine (for a carby model) was around $160.
From memory toecutters problem was the 'fly by wire' module. Is that correct threedogs?
If so I think that might be different to a TPS.
I'm probably wrong though!

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[patch697]

Wow, $500??? I wonder how different the price is between efi and carby models. Mine (for a carby model) was around $160.
From memory toecutters problem was the 'fly by wire' module. Is that correct threedogs?
If so I think that might be different to a TPS.
I'm probably wrong though!

Tap, crackle, pop

The TPS for the carby models is a much simpler unit which was installed as a stand alone for autos only so I can see why they'd be cheaper.

[taslucas]

The TPS for the carby models is a much simpler unit which was installed as a stand alone for autos only so I can see why they'd be cheaper.

Yeah I have one.
Where is the tps for an efi?

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