Thread: No acceleration, engine dies.......

Try changing the sensor on the inlet manifold, MAP, I think its called. I had similar symptoms although mine happened occasionally & always cleared. Turns out that the sensor also reads air temperature & when this reading goes above 100 odd degrees, the ECU cuts the throttle input.

Hi Milton477,
Ok, I have checked the MAF sensor voltage and the temperatures, they all appear to be normal, around 31 to 32 degrees C in the shed we are expecting 31 degrees ambient today so this seems right, nothing above 100 degrees C.

This morning I have removed the MAF sensor and cleaned it (again) checked all the connections and also removed the ambient air sensor out of the air box and cleaned that as well.

The throttle sensor voltages go up and down as described so I am now moving away from the accelerator, however depending on the start the engine either revs or has no throttle response at all, when the start is with no throttle response it is literally that, nothing, it is like the throttle is disconnected, engine just sits on idle. Go for another start and the engine will rev albiet slowly and then have enough power to get the vehicle back into the shed.

Fuel pressure is steady (ish) all through all excersises at 100 to maybe 101.kpa never wavers. Can I assume that the pressure should be higher than this, does the throttle response increase the the fuel pressure and activate the high pressure side of the pump?

Waiting for my step-son to arrive so I can plug into his D2.

I thought this would have been relatively easy to diagnose I thought someone would have had something similar. Yours is similar Milton however not the same, thank you for your suggestions.

Chers Marty

Hi Sierrafery,
I have checked the voltages everyting seems to be in order.

Cheers Marty

This is way out of left field and it's been many years since I did anything on a D2 but is it possible that a fuel line is in the wrong spot when you put it back together. ? I'm not even sure if that can happen .

I think they pump a lot more fuel than they use, is it possible the fuel lines are on the wrong way around.

Just to throw in a curve ball.

Cheers Ean

Hi Sierrafery,
Everything I have read, especially the bit in Rave manual about the fuel pressures, I should b seeing 400 kpa at the head manifold and I am only seeing 100 kpa which is a 1/4 of what it is supposed to be, you could be on the money with his one.

Cheers Marty

Originally Posted by Nomad9

Hi Milton477,
Ok, I have checked the MAF sensor voltage and the temperatures, they all appear to be normal, around 31 to 32 degrees C in the shed we are expecting 31 degrees ambient today so this seems right, nothing above 100 degrees C.

This morning I have removed the MAF sensor and cleaned it (again) checked all the connections and also removed the ambient air sensor out of the air box and cleaned that as well.

The throttle sensor voltages go up and down as described so I am now moving away from the accelerator, however depending on the start the engine either revs or has no throttle response at all, when the start is with no throttle response it is literally that, nothing, it is like the throttle is disconnected, engine just sits on idle. Go for another start and the engine will rev albiet slowly and then have enough power to get the vehicle back into the shed.

Fuel pressure is steady (ish) all through all excersises at 100 to maybe 101.kpa never wavers. Can I assume that the pressure should be higher than this, does the throttle response increase the the fuel pressure and activate the high pressure side of the pump?

Waiting for my step-son to arrive so I can plug into his D2.

I thought this would have been relatively easy to diagnose I thought someone would have had something similar. Yours is similar Milton however not the same, thank you for your suggestions.

Chers Marty

Hi Marty,

Just to clarify, I am talking about the MAP (Manifold absolute pressure/ inlet air temperature sensor) located on the inlet manifold. It was the spurious high temperature readings from this sensor that was preventing the throttle response. My MAF & Ambient Air Temp were fine. I only found the problem when I looked at a trend of the temperature downloaded from my Nanocom.

Good luck.
Regards
Rory

Originally Posted by Nomad9

....
Fuel pressure is steady (ish) all through all excersises at 100 to maybe 101.kpa never wavers. Can I assume that the pressure should be higher than this, does the throttle response increase the the fuel pressure and activate the high pressure side of the pump?

How did you measure that pressure cos it's impossible with nanocom, or any other tester, it's doable only with a pressure gauge..... and if it's with a gauge you can change the pump pronto cos it should be around 400Kpa in the FPR in the FT seensor's port, and 500-600 on the pump HP output, if you get only around 100 it's certain that the pump lost the HP stage.... i hope you're not confusing the fuel pressure with the ambient pressure though

Hi Sierrafery,
I've just been and checked again, much as it pains me , you are right, the manifold pressure I am seeing is actually the inlet manifold pressure I now believe, not the fuel manifold pressure, however I am still only hearing one pump kick in. I'm still hedging my bets on the fuel pump.

Cheers Marty