rough idle, 5-spd

[SBAtdijetta]

SB, you aren't going to take it to 5?

You should be good at it now..

Yes I think I am an expert by now... But 3.x should be good if I want to go further.

 

[Mach1]

Man, you have done it more times then I have..you are the expert!!

 

[06SpiceRedTDI]

The problem with advancing the cam timing without locking and reseting the tension is that proper valve timing is not guaranteed.

I don't see how this is true, seeing that only the camshaft is moved when making the adjustment, not the pulley in relation to the crank pulley, Nothing is changed as far as tension of the timing belt goes.

 

[Mach1]

spice, you are correct on that..doesn't change tension on the belt..

 

[aNUT]

I don't see how this is true, seeing that only the camshaft is moved when making the adjustment, not the pulley in relation to the crank pulley, Nothing is changed as far as tension of the timing belt goes.

You are correct that the pulley does not move in relation to the crank pulley. That said however, when you loosen the three bolts that hold the cam hub to the pulley, you allow independent movement of the cam in relation to the pulley. When you move the cam hub, you move the valves too.

Have a look at your Bentley, specifically the exploded diagram of the head. You'll see that when you replace a belt on these cars, you're not locking the pulley, but the cam itself.

The reason for this set up is to allow you to set proper tension on the belt while not moving the cam. As you tension the belt the cam pulley retards, but since it is loose on the cam, it's allowed to 'float.' After setting tension, you affix the cam sprocket to the cam hub via the 3 bolts.

 

[hutchman]

Our A5 used to stumble and shake at a stop light sometimes but has not done it once since if replaced the DMF/clutch with G60/VR6.

I checked block 4-4 of the Engine tonight and mine read -1.5. I do kind of notice a performance hit although I have been away for a year. I remember running it up to 4.5k RPM and it getting there pretty quick but now with almost 70k miles on it ... it doesn't get up to 4.5k RPM as quick now that I am getting used to driving it again (been in Iraq for a year).

I might have to try this and see if the power comes back like I remember.

 

[SBAtdijetta]

I remember running it up to 4.5k RPM and it getting there pretty quick but now with almost 70k miles on it ... it doesn't get up to 4.5k RPM as quick now that I am getting used to driving it again

Hutch,

The 06 is not chipped?.... Why...lol j/k

Anyway you may want to pull the upper IC pipe to see if you have any sludge build up. Then clean it and get her chipped with a mild stage 1 and have who ever you use turn down or off the EGR. You will love the power of the BRM you have a stage 1 chip.

Just my .02

 

[Mach1]

Hutch, welcome back, i remember your posts..

Do the cam timing, you will like it!!


Get the RC... i second the vote..

 

[hutchman]

Hutch,

The 06 is not chipped?.... Why...lol j/k

Anyway you may want to pull the upper IC pipe to see if you have any sludge build up. Then clean it and get her chipped with a mild stage 1 and have who ever you use turn down or off the EGR. You will love the power of the BRM you have a stage 1 chip.

Just my .02

Yea, I know but hey, it is the wife's car so what can I say. It is quick enough for her to get tickets as is . I wish I would have brought it to Impex so those dent wizzard guys could have worked their magic on it .... my 02 has way less dings than hers!

All my effort has been in building the 02 up right.

I've been wondering if this BRM is prone to the earlier model EGR problems. EGR area looks more complicated and harder to get to than on a VE.

I'll have to try this mod out when I get some time.

 

[Mach1]

The EGR doesn't carbon up like the older models, When you chip it you can have the EGR shutoff or down to nothing...Thats the beauty of it. Then finish off the job with a block off disc.

 

[Dawgz83944]

VW finally fixed mine. Took 7 visits (2 months worth) and cost VW roughly 10-13k. The final solution was a "known" issue with the cylinder head. I say "known" because the solution magically presented itself AFTER I called a lawyer and files a lemon law lawsuit. The issue they say is that the heads will allow blowback from the pressures in the cylinders and actually blow back into the intake. At any rate they repalce the cylinder head and all is glass smooth.

Those with the problems, here was my experience on the syptoms. I bought the car in November of 07 and all was well as long as temps were below 45-50*F. After that the car would rock back and forth until I raised the rpms to 1000 or turned on the A/C. If this is you, thats the fix.

 

[Hurst89]

Also, if they replaced the head, they would have had to retime the engine, and if they did that, they would have to do that according to the service manual, which would have been what all of us who have done the timing change are doing. I don't see how a head design can "allow" blow back, that would be cam timing and duration of the valves. I am betting what really was the "fix" was the service department retiming your engine after the new head...but hey, no reason to cpmplain about a new head for free! That's just my $.02... It would be interesting to have your old head back and try it with the proper timing to see what happened.

Hurst

 

[cumminsfromthecold]

Rough Idle, 1999 MKIV Jetta - Codes as 1248

... which is "failure to commence injection." or something like that. Rough Idle only happens under 1600 rpm. Otherwise, she still zips around like normal. Tried a few things:

1) changed fuel filter.
2) removed/drilled out the check gauge in the vacuum line at the lift pump (atop the fuel tank).
3) changed engine oil - did a three stage flush with BG products - engine purge and oil treatment, all with Valvoline Premium Blue Synthetic 15-40 (spendy!)

No change in the rough idle. The tech I slipped $10 to to put the diagnostic on it said he'd next check the timing belt (it was changed 60,000 miles ago) and the cam balance. Timing belt may do it, he says, but may not.

The car runs on spec biodiesel, currently a B50 blend, and I always keep some level of bio in it, per the advisory issued by Biofuel Oasis in Berkeley, CA:

http://biofueloasis.com/html/basics.html

and see "Ultra Low Sulfur Diesel Warning."

It's got 138,000 miles on it and has been well cared for.

Maybe it's just the injector pump's time, but I gotta wonder about the ECM messing it up, as someone on this list suggested. That'll be my next step. We'll see what happens. Theories welcome...

Ronnie
Truckee, CA

 

[syntrix]

Rough Idle, 1999 MKIV Jetta - Codes as 1248

Ronnie
Truckee, CA

Ronnie, you put a MKIV in your title, that's not an A5, which is the subject here.

Your ALH can be manually timed at the IP. Procedure is similar to what is described here by "bumping". Use a vag-com to see if timing is in check.

 

[cumminsfromthecold]

Alh?

Thanks Syntrix - my mistake. Um, what's ALH?

 

[syntrix]

Engine code, as BRM is found in the MKV's being discussed here.

 

[Dawgz83944]

Also, if they replaced the head, they would have had to retime the engine, and if they did that, they would have to do that according to the service manual, which would have been what all of us who have done the timing change are doing. I don't see how a head design can "allow" blow back, that would be cam timing and duration of the valves. I am betting what really was the "fix" was the service department retiming your engine after the new head...but hey, no reason to cpmplain about a new head for free! That's just my $.02... It would be interesting to have your old head back and try it with the proper timing to see what happened.

Hurst

They tried retiming the car 2 times. Not sure how they did it. I would imagine, although not sure, they increased valve spring pressure on the new heads. I can only report what they've told me. They specificaly said blow by or back hinting at a valve sealing problem.

 

[Lightflyer1]

What was the part number for the new head? Unless they made a special one for you, you got the same head as before.

 

[Dawgz83944]

What was the part number for the new head? Unless they made a special one for you, you got the same head as before.

I'll double check, I think there was a revision letter at the end not sure what it was.

 

[Mach1]

Dawg, interesting, but I got to say, If the dealership told me they had to replace the head on my engine to get it to idle correctly/smoothly, I would have declined..Theres no way I am going to pay for a new car, that has been experimented on..

Nothing against you, I have heard about Too many people that accept a dealer throwing SO many parts at a brand new car to fix it..

Where do you draw the line on how much they throw at it, head, engine?

I just wouldn't do it...

 

[06SpiceRedTDI]

The issue they say is that the heads will allow blowback from the pressures in the cylinders and actually blow back into the intake.

The only way this seems possible is if the CAM timing is off, as discussed in this thread.

 

[Dawgz83944]

The only way this seems possible is if the CAM timing is off, as discussed in this thread.

Well I dunno, the Germans have never ceased to amaze me with their krap anyway. Here is the P/N on the head 038 103 373 R. I don't claim to know a lot about TDI's which is why I have to go at face value at what the Dealership says. The Cali dealers don't know a lot about them and VW tech line was involved. If all it was is the timing then they (VW and/or the dealership) are a bunch of 'tards.

 

[Lightflyer1]

I "think" the R stands for rebuilt. If so you got the same head probably and new timing.

 

[bergy]

Rough Idle and more

I’d like to thank everyone for their work to find this problem. I have been working with a several dealers for over 6 months. They have cleaned and replaced the EGR, retimed the car injection, replaced the fuel pumps, filters, and the entire head (new injectors) (Again the whole thing about exhaust blow back was given for an explanation). I still have a rough idle (not when cold). My measuring blocks at idle are group 4 block 2 is 0.0 BTDC and block 4 is 0.0. I am going to try the adjustment posted here.

It seems that I have another problem when I rev up the engine in neutral though. At 1500 to 3000 rpm I the engine speed bobs up and down with what sounds like the EGR going on and off. When the engine is brought to above 3000 rpm while in neutral, the engine speed will proceed to steadily climb to around 4000 rpm with no change in pressure on the throttle pedal. The dealer can’t seem to figure what is going on with this one either and all the problems have persisted after each successive fix at the dealer. Any ideas out there about my second problem?

 

[SootHappens]

Any ideas out there about my second problem?

Try the timing adjustment and see if your second problem changes... just a thought

 

[bergy]

Second problem still arround

I advanced the timing like everyone has been posting about and my idle is better. I have yet to do a long drive. My group 4 block 4 readout is not 3.4 instead of 0.0. I did notice however when switching from regular diesel to bio group 4 block 2 went from 3.4 to 0.0BTDC.

The second problem with what sounds like the EGR cycling on and off still plagues my car and the motor is really rough above 4000 rpm in neutral.

I'll look into other ideas but I think the dealer has given up on me. They had their top tech drive it arround for a day and collect data on my Jetta, but I have not heard anthing from them in 6 weeks. I do call every couple to see what they are doing. I think they are waiting for my warrenty to expire.

 

[10-cc]

Hi,

Did anybody had a similar problem? After a rough Idle?
Here is what the dealer did:

First they changed an injector that gave a different output than all others.
After few miles driving, the rough idle is back (the car warmed up).

Went to the dealer and told them that it is the same, and told the head mechanic to change the timing to at least 0 or +2 (it was at -2)
I left the car at the dealer and went to work. At work I get a call from them saying the the O rings of the injectors contaminated (????) my fuel and the fuel tank, so they have to wash the fuel tank and change all injectors and feul filter.

When I asked How the O rings can contaminate, they sayed that they were burned?


.

 

[Mach1]

Customer beware...

 

[YukonTDI]

Rough Idle

My wife took my TDI rather than her 2.0 turbo and when it came back it was idling very rough. One symptom was then starting off, there was a slight vibration through the steering wheel. Something didn't feel right. The dealer took it in today and told me that the dual mass flywheel was starting to separate. They had one in stock and I will have it back tomorrow. Will keep you posted. Also test driving the 09 TDI Jetta tomorrow.

 

[bergy]

Rough idle

Hi,

Did anybody had a similar problem? After a rough Idle?
Here is what the dealer did:

First they changed an injector that gave a different output than all others.
After few miles driving, the rough idle is back (the car warmed up).

Went to the dealer and told them that it is the same, and told the head mechanic to change the timing to at least 0 or +2 (it was at -2)
I left the car at the dealer and went to work. At work I get a call from them saying the the O rings of the injectors contaminated (????) my fuel and the fuel tank, so they have to wash the fuel tank and change all injectors and feul filter.

When I asked How the O rings can contaminate, they sayed that they were burned?



.

My dealer told me about some possible issues with bad injectors allowing backflow of the exhaust soot through the injector and contaminating the fuel, but never a burnt o-ring. Just sounds like soot on the o-ring. It seems that a dealer who doesn't know the real problem ends up blowing a lot of smoke instead to telling the story straight. no pun intended. I will say that since my timing was advanced to 3.4 it is a bit slow of the start. I might have to back it off 1.5 to closer to 2 degrees advanced. I still have a little rough idle. Who knows what is really wrong. Ive come to the conclusion my dealer knows nothing.