Misfiring cylinder

[nightghost]

I been told by a tech that my car has Misfiring cylinder. he is telling me the total cost for changing 4 valves will cost about 1300 total . should I take my car to some body else . is it that cost to change valve.plus he is telling me it will take 10 days to do it because of busy secdule.

can i cange it by my self .and inorder to change it will it need to remove the engine from it place.could it be just the spark plugs.

97 boxster

80k mile

2.5

tiptronic

Edited April 3, 2006 by nightghost

[Loren]

Do you have P-codes?

Did the tech run a compression test? on all cylinders?

[nightghost]

Do you have P-codes?

Did the tech run a compression test? on all cylinders?

I will go tomorrow and get the p-code from the tech.

can you please tell me what Kind of qustions I need to be asking the tech guy.

thanks

[nick49]

How does he know that it is a valve related problem? If so it is usually very unlikely that all 4 on one cylinder would need replacement. What event does he suspect lead to valve failure? I was under the impression a failed intermediate shaft is usually what causes valve damage. If so it is unlikely it is on just one cylinder. And you would not be driving the car if this is the case.

Another point is that $1300 sounds really inexpensive in my book to remove the motor, pull a head, remove and replace 4 valves, recut the seats, replace 4 seals, replace head and related gaskets, reinstall cams, timing chains, etc. and reinstall the motor in the car.

If you don't understand what to ask the tech, I think you may have a difficult time disassembling this motor and repairing it yourself. Lots of special "Porsche" tools are required to do the job without ruining things. This is nowhere near as simple as a typical American V8 or even a Japanese DOHC motor.

Good Luck!

[nightghost]

How does he know that it is a valve related problem? If so it is usually very unlikely that all 4 on one cylinder would need replacement. What event does he suspect lead to valve failure? I was under the impression a failed intermediate shaft is usually what causes valve damage. If so it is unlikely it is on just one cylinder. And you would not be driving the car if this is the case.

Another point is that $1300 sounds really inexpensive in my book to remove the motor, pull a head, remove and replace 4 valves, recut the seats, replace 4 seals, replace head and related gaskets, reinstall cams, timing chains, etc. and reinstall the motor in the car.

If you don't understand what to ask the tech, I think you may have a difficult time disassembling this motor and repairing it yourself. Lots of special "Porsche" tools are required to do the job without ruining things. This is nowhere near as simple as a typical American V8 or even a Japanese DOHC motor.

Good Luck!

how long do you think it will average mechanince to do the job.and is it really worth 1300.and the tools is really just for posche or is it shared by all imports like audi ,bmw,benz.

and its not about the money its also about time. he told me I have to wait 10 day before I get my car done.

I have spent about 5000 on this car last month .So I really need to have it fixed and save money.

Edited April 4, 2006 by nightghost

[nightghost]

I went to repair shop today.the guy told me the computer does not have code for problem like that he said he could tell from the sound of the car that its the valve lifter and he said every thing looks fine but to make sure he need t remove the camshaft inorder to make final determination.

do you guys think I should take it to somebody else.he is charging $880 for installing 4 valve lifter not including the parts.

[Rom]

Valve lifters and valves are totally different things... You started this post saying that he'd replace the valves at $1300, and now he wants to replace the lifters for $880... Sounds to me like he has no clue as to what the problem is. Has he worked on Porsches' before? The Flat-6 makes some unique sounds - hopefully he's not mistaking them for a valvetrain issue. Are you experiencing any problems driving the car?

The valve lifters, while still a lot of work, doesn't need the head to be pulled from the engine... However, I doubt he could do it in-situ as there is not much space! Does he know where the engine is? ;) Just sounds a little cheap for the work being proposed by a garage...

Get a second-opinion from another garage (that specialises in Porsche)...

Thanks!

Shash

[nightghost]

I WAS READING OLD FORUMS AND THIS GUY HAD THE SAME PROBLEM AS MY CAR. EVERY ONE ELSE SAID ITS A VALVE LIFTER BUT IT TURN OUT THAT THE CAR Had oil blockage.I posted the sound few days ago you could go back and try to download the sound file.

http://www.iboston.com/myengineclick.mp3

http://www.renntech.org/forums/index.php?showtopic=8610

Edited April 5, 2006 by nightghost