http://www.myturbodiesel.com/1000q/multi/limp-mode-TDI-fix.htmI have a 2000 VW Golf TDI, and I am loosing power when I am driving uphill. FOr example: I am in 5th gear, driving with 75 m/hour and all of a suddent am am slowing dorwn evenb though the accelerator pedal is all the way down. What may bethe cause?
It's not the fuel temp sensor as you already found out. You're hitting limp mode. Look through the limp mode troubleshooting article in the FAQ.I have a 2000 Golf Diesel, 127.000 miles. I have the same problem. Not enough power. When I drive uphill 75-80 miles per hour all os a sudden I feel I am slowing down loosing speed even though my accelerator pedal is all the way down. I have the same problem on flat road with the AC running for a long time. I feel all o a sudden I am loosing speed and I need to shft in lower gear.
I took it to Autozone to put the scanner on. The only code that pops out is P1163 regarding fuel temperature senosr. I bought a new one and replaced it. Same problem,same code showing up still no power. What should I do?
Another day working on the car and no success. I checked for power the conector that goes in the N75 solenoid and the ground is really really really really week. I traced the wire and goes into the computer in the middle of the car, under the windshield.Have you done a boost leak test? You said you checked the hoses but do an actual boost leak just incase you're missing something.
Reference your vacuum line diagram under the hood. Triple check that all lines are going where they need to be going. You've replaced a bunch of stuff so it's possible something has been misplaced.
Datalog the boost - you've already replaced the sensor so you just now need to figure out if the turbo is putting out correctly. Also datalog the MAF - saving a chart may give you some clues.
The compression is not great but it's not horrible. A healthy engine should be in the 400-500 range but as long as it's consistent it shouldn't be causing your problem.
Also check the EGR solenoid and function - maybe the EGR gasses are displacing the intake air which is lowering the MAF reading. More likely is that there's a turbo control problem which is causing low boost but you havent' said that you datalogged the boost values.
Do you mean inches of Hg(mercury), or do you intend to say millimeters? 25mm seems quite low, ~10", mine currently is ~22"Hg. I had not seen anywhere a specification for the vacuum pump and how much it should produce.This is an old thread but for the benefit of DIY'ers, there is one thing that gym_flo has not mentioned and that is the amount of vacuum. Like him, I changed my timing belt and started having performance problems and bad fuel economy. With a mityvac, I was able to pinpoint the vacuum pump as the problem. Vacuum at the small nipple at the first junction from vacuum pump was 15 mm Hg. It needs to be >25 mmhg. It turns out that the vacuum nipple was loose (can be turned) and was leaking at the border of the housing and the nipple. I patched this with epoxy (had to remove pump).
A good place to check vacuum is at the top nipple of the N75. It should also read >25 mmhg