Question about 2002 Volkswagen Jetta TDI

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2002 vw bettle tdi surging, only at idle in gear. clears up under power

Car surges while in gear at ide, clears up under power.

already done fuel temp sencer changed, intake cleaned

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  • stalizabeam Oct 08, 2008

    Not POSITIVE that its the same thing wrong, but basically after my Jetta has been sitting while I'm at work or sometimes overnight, when I put it in drive and I'm idling (at a stoplight or whatnot) it shakes heavily and feels like it's about to cut off. The problem stops after I drive it for a couple minutes though.

  • Anonymous Mar 21, 2014

    power surges under load, loses power and then takes off again, have changed plugs and filters and put injector cleaner in fuel, any other ideas?

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  • Volkswagen Master
  • 22,246 Answers

Is this model common rail or does it have an injector pump,injector pump has a built in lift pump and if this is weak then the transfer pressure is low which is causing scavanging.if this is the case then fitting an in line non return valve in the fuel in line can help,but more often than not fitting a low pressure in line fuel pump is a cheaper solution than an injector pump overhaul

Posted on Nov 05, 2008

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Posted on Jan 02, 2017

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Need to fix surging and rough idle problem.


Ford likes to hide vacuum lines under the plenum and put rubber elbows on them that deteriorate from the inside out, Major vacuum leak. You don't have to remove the plenum to replace them, but they tend to be a pain to do it. Also clean the throttle body, inside. Remove the air intake plenum, use a tooth brush and what you cleaned the MAF sensor with or brake clean. Clean the back of the throttle plate and where it sits around the inner throttle as best you can. Start it up(takes a few seconds or so) and spray it in the throttle(rev it up and keep it running). Check the air filter. Dirty, replace it. If you have never replaced the fuel filter, Replace it also. It won't cause your problems, But it is the most neglected part of the vehicle.

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97 toyota surges at an idle


(which engine. ?????)_
as always check all fuses. and scan the ECU for DTCs. first.
there is no need to fix OBD2 cars like 1980 cars (hard rows to hoe)
it can be 2 problems this......
lets fix the easy one first. idle. (and hope for moving issues to fix for free) it idle car is parked, so is 100% safe tests. (not moving)

so it surges at idle.
questions.?
1: hot or cold or both.?
2: low extreme RPM and high at idle.

400 to 800 RPM? surge.
1000 to 2000. what? numbers tell the tale.

first off, idle is the last thing to work right on any engine.

there are many ways to find what is wrong.
fix idle surge way.
i make sure that the engine holds closed LOOP status.
hot idle, if not , i fix that first.
keep in mind if not in closes loop and lean
all lean engine surge and guess what the ISC will add to the surge
because idle is way too slow, so the ECU open the ISC wider
and wider and its still too slow, so the ECU resets the ISC
this cause a worst hunt (surge)
the ECU adjust spark time and the ISC to get 800 rpm. (spec. look up yours)
so say , i see closed loop failed, OBD2 scan page 1
i look at the O2 sensor an its stuck lean.
if stuck lean and it really is (o2 bad?) then its lean and it will surge
.
examples.
1: i find 02 sensor bad, (only effects idle and light steady cruise)
2: i find fuel pressure at 15PSI , hopeless low .
3: i find all injectors clogged. and lean.
4: with MAF EFI, ( i find maf reading too low, (dirty) causing lean.
5: if MAP car, i find the MAP stuck hard high vacuum causing lean.
not knowing what engine you have or the idle hot surge range,
i can not go farther.

the driving bog tells me,
1: scan the ecu ,get DTCs; do that first.
2: clean MAF if car has one, ask how..
3: check fuel pressure.


my guess is engine is lean. and starving for fuel all the time.
cept WOT.

MAF cars starve for fuel if there are any vacuum leaks.
MAP cars do opposite, they race fast with 100% full power.
MAF is air density EFI
MAP is speed density EFI.
apples and oranges diffr. so what engine.


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I would go with a clogged exhaust converter

Also possibly a bad fuel pressure regulator & spyder
poppet valve assy under the intake manifold

That is a common problem if you smell gas

Replace the front oxygen sensors every 100,000 miles

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