My engine died... not from an IMS failure

[Pdwight]

Tune options ?

[KRAM36]

Originally Posted by Pdwight

Tune options ?

Some say push a tune from a 996 of the same year as your car into it or do a dyno tune. The 2004 Special Edition came with the 987 air box with the larger MAF housing, so I might be able to push a tune from one of those and be good since mine is a 2003 and has the same engine.

However I'm going to go with a dyno tune when the time comes.

I believe I read our cars can adapt up to a 20% increase in air volume before running lean. The MAF house size is programed into the car's DME, so if you change to a larger MAF house the MAF sensor can not correctly determine the amount of air going into the engine. I think it will even throw a CEL when using the 987 MAF house.

[Topless]

Figure 2-3 hours labor to get a good look at the problem. Pull the plugs and scope the suspected cylinders. Then drop the oil filter and inspect for grenade frag. If a cyl has failed or the filter is loaded with shiny bits, the motor is now a boat anchor IMO. I would not rebuild a grenaded m96. A clean motor from a dismantler offers a lot better option and higher success rate for my $$.

If everything looks good and clean except the misfire in cyl #4, a valve spring is very likely. This is certainly worth a repair attempt for reasonable $$.

[Pdwight]

THis has been going on for over a week or so....I would have the filter out, the oil out, the plugs out....drop the pan and put my eyeballs on the internals to see what is what....or more importantly what is not

[healthservices]

Well if the whole one side has lost compression, I would think that a cam jumped gear, lost timing, or because of that, bent valves. And because of that once it is determined that the valves are bent. the head will have to come off at the very least to correct. Am I wrong?

[Swhitcomb]

Originally Posted by healthservices

Well if the whole one side has lost compression, I would think that a cam jumped gear, lost timing, or because of that, bent valves. And because of that once it is determined that the valves are bent. the head will have to come off at the very least to correct. Am I wrong?

This exact thing is what happened to my car last July. Cost me 15.2k.

[Pdwight]

If your engine were on the verge of doing this could you detect it using a durametric to see cam deviations ?