arcking
Well-known member
Backstory
I'm working on a 2002 Jetta with the ALH & 02J that I purchased from jwp175 last summer. At the time, it needed some TLC (namely addressing that it was low on power and needed some front end work). Unfortunately, I didn't have the time to really dig into the issues, so I took the car to a local mechanic in the fall (recommended on this forum) - he fiddled with it off and on for a couple of weeks, but eventually gave up on it. He did put a new MAF sensor on it (old one was topping out in the 750-850 range if I remember correctly), but it still didn't have the power it should have.
After I got it back from the shop, I put a set of cheap nozzles in as a trial and it seemed to gain some power and the (white) smoke was abated when accelerating. I've only driven one other ALH and this one doesn't seem to have anywhere near the low-end power the other had (can't say for sure if the other one was stock or not, but it was AFAIK).
Car
2002 Jetta Sedan
234,000 miles
ALH Engine
02J 5-Speed Transmission
Issue
The car doesn't seem to have the low-end 'oomph' I expect it to have, even in low gears. The other car I've driven/ridden in could chirp the tires in 1st from a start if you really pushed it...this one would be very hard pressed to spin the tires on wet asphalt! It seems to have a bit of power once you get up to 2-2.5k RPM, but I'm not sure it has all that it should.
What's Been Tried
Between the mechanic and I the car has had the following done:
Logs
I'm hoping that those of you more experience with well-running ALHs will be able to provide some insight given these logs - I can speculate, but really have no idea what a 'good' log looks like. All of these were logged based on the instructions from Malone with 3rd gear runs from ~1500 RPM to WOT. Maybe I'm just expecting too much? (I will add that flat roads are hard to find, so take driving on a slight incline/decline into consideration)
Group 1
Group 3
Group 4
Group 8
Group 11
Group 15
The logs raise a few questions in my mind - some general, some more specific:
Thanks in advance for your help! I'm eager to learn more about the VE engines and get this Jetta running well.
I'm working on a 2002 Jetta with the ALH & 02J that I purchased from jwp175 last summer. At the time, it needed some TLC (namely addressing that it was low on power and needed some front end work). Unfortunately, I didn't have the time to really dig into the issues, so I took the car to a local mechanic in the fall (recommended on this forum) - he fiddled with it off and on for a couple of weeks, but eventually gave up on it. He did put a new MAF sensor on it (old one was topping out in the 750-850 range if I remember correctly), but it still didn't have the power it should have.
After I got it back from the shop, I put a set of cheap nozzles in as a trial and it seemed to gain some power and the (white) smoke was abated when accelerating. I've only driven one other ALH and this one doesn't seem to have anywhere near the low-end power the other had (can't say for sure if the other one was stock or not, but it was AFAIK).
Car
2002 Jetta Sedan
234,000 miles
ALH Engine
02J 5-Speed Transmission
Issue
The car doesn't seem to have the low-end 'oomph' I expect it to have, even in low gears. The other car I've driven/ridden in could chirp the tires in 1st from a start if you really pushed it...this one would be very hard pressed to spin the tires on wet asphalt! It seems to have a bit of power once you get up to 2-2.5k RPM, but I'm not sure it has all that it should.
What's Been Tried
Between the mechanic and I the car has had the following done:
- Cleaned intake
- Chemical cleaning of turbo
- Cat removed
- New MAF sensor
- New air filter
- New fuel filter
- Cleaned in-tank pickup
- Physical timing checked
- Timing checked in VCDS
- Snow screen cleaned
- New nozzles - not tested/balanced (no way to justify the cost for this car)
- Likely a few other things I've forgotten, and anything the mechanic did that we didn’t discuss...
Logs
I'm hoping that those of you more experience with well-running ALHs will be able to provide some insight given these logs - I can speculate, but really have no idea what a 'good' log looks like. All of these were logged based on the instructions from Malone with 3rd gear runs from ~1500 RPM to WOT. Maybe I'm just expecting too much? (I will add that flat roads are hard to find, so take driving on a slight incline/decline into consideration)
Group 1
Group 3
Group 4
Group 8
Group 11
Group 15
The logs raise a few questions in my mind - some general, some more specific:
- What does Mod Piston indicate?
- Is the slight lag in requested vs actual injection timing to be expected?
- Why do the Torque Limitation and Smoke Limitation fall below the Torque Request?
- What does the lag and the overshoot in Boost Actual mean? I assume these should fall more closely in line, I believe they do on my BEW.
- Why does Injected Quantity actual lag behind (and never reach) Injected Quantity Requested? How big a deal is the 5-6 mg/str difference? Also, why does the Injected Quantity actual fall away towards the higher RPMs while the Injected Quantity Requested not?
Thanks in advance for your help! I'm eager to learn more about the VE engines and get this Jetta running well.