1994 530i rough idle, cylinder miss?

[Been-Jammin]

Does it still have the miss or did that smooth out some?

Is there a code from the CEL during warm up?

1444 = no codes

Still running rough, but there was no check engine light today...

[632 Regal]

your computer thinks it supposed to run with all them leaks and stuff...Did any of the plugs look a lot different than the others?

[Been-Jammin]

your computer thinks it supposed to run with all them leaks and stuff...Did any of the plugs look a lot different than the others?

They were all about the same, the NGK's I pulled out looked aged on the outside and the nodes were covered with thick white deposits over a carbon build up. The two closest the firewall seemed a bit darker.

The tailpipe is nice and clean, no black deposits to the touch.

[632 Regal]

id still vote gaskets...no fear man!

[infinity5]

the suspense is killing us man, give us the results of the leakdown test!!!!

[Tiger]

IMPORTANT!!! Remove Bosch 4417 Platinum +4. BMW do not like them at all... Reinstall factory standard plugs.

[Been-Jammin]

IMPORTANT!!! Remove Bosch 4417 Platinum +4. BMW do not like them at all... Reinstall factory standard plugs.

Thanks! I know how cars can be picky about plugs. I appreciate the insight.
I'll pick up a set of Bosch F7LDCR's for this weekend's project work. Going to have them out to do the compression and leakdown tests anyhow.

[Been-Jammin]

I've ordered all the parts that I previously listed as well as an oil filter for good measure. They have all been shipped today and will be in Friday (if UPS is on time)

Here's the plan for this weekend: (taking photos)
1. Compression Test (check each cylinder's compression)
- If any are below 145, prepare for the worst, hold my breath.
2. Leakdown Test (check each cylinder for valve/cylinder leak)
- If results are really bad, turn purple, stop and prepare for a new block (save the new parts for the rebuild. )
- If results are marginal or above, continue (exhale and commense last ditch effort)
3. Replace valve cover gaskets/bolt grommets
4. Replace Intake, PCV and all associated gaskets/grommets
5. Install New OE Spark Plugs / New Plug Boots
6. Say a prayer (very important)
7. Start, warm up, test drive, check for any engine codes.
- If successful, do the "happy dance" in front of all the neighbors letting out a Woo Hoo that makes them all wonder about living in my vicinity.
- If unsuccessful, go do some burn outs in the church parking lot, maybe give my x a lawn job and test the rev limiter. Steel a jug of holy water from the church and top off the coolant reservoir. Pray for immaculate compression.
8. Change oil, drink a beer, relax by the pool for a few, get a sunburn, forget about the car for a while. Enjoy unmarried life a bit.
9. Download pictures from the camera, nurse my sunburn and post the results. May be Sunday by then...

[632 Regal]

before your panties bunch up so far that they constipate you read this:

If a cylinder is missing it isn't operating correctly (duh) and as so it wont have the same sealing characteristics as the cylinders next to them..as in oil hold out on the cylinder walls, rings and stuff. So dont totally freak...there is NO ****IN WAY i would want to know the leakdown on my perfectly fine running Nikasil block. It's when peroblems rear their head they can and do look worse when scientificly testing without a norm...such as all cylinders firing cause of leaks etc.

In the old days I used to buy peoples hydraulic cammed engines day after day cause of compression related falures :IE the lifters would collapse from the valve spring preload resulting in at least a couple weak cylinders.

May the force be with you!

[Gayle]

I've ordered all the parts that I previously listed as well as an oil filter for good measure. They have all been shipped today and will be in Friday (if UPS is on time)

Here's the plan for this weekend: (taking photos)
1. Compression Test (check each cylinder's compression)
- If any are below 145, prepare for the worst, hold my breath.
2. Leakdown Test (check each cylinder for valve/cylinder leak)
- If results are really bad, turn purple, stop and prepare for a new block (save the new parts for the rebuild. )
- If results are marginal or above, continue (exhale and commense last ditch effort)
3. Replace valve cover gaskets/bolt grommets
4. Replace Intake, PCV and all associated gaskets/grommets
5. Install New OE Spark Plugs / New Plug Boots
6. Say a prayer (very important)
7. Start, warm up, test drive, check for any engine codes.
- If successful, do the "happy dance" in front of all the neighbors letting out a Woo Hoo that makes them all wonder about living in my vicinity.
- If unsuccessful, go do some burn outs in the church parking lot, maybe give my x a lawn job and test the rev limiter. Steel a jug of holy water from the church and top off the coolant reservoir. Pray for immaculate compression.
8. Change oil, drink a beer, relax by the pool for a few, get a sunburn, forget about the car for a while. Enjoy unmarried life a bit.
9. Download pictures from the camera, nurse my sunburn and post the results. May be Sunday by then...

With a plan like that the mysterious forces of the universe will have to smile on you. Please have someone there to video the happy dance.