CEL just came on. Any ideas?

[ALPHA 3.0i Z3]

Hi all the CEL ( little engine symbol) just came on on the Z...i can get a code reader tomorrow but wondering if anyone has ideas.
Happened once before, about 2 hours after buying car and went away.
A

[peter2b]

when mine came on it was due to an air leak on the intake
peter2b

[colb]

Code reader is only way to see what has set it off and point you in the right direction, could be cam shaft sensor or any number of things.
Post the code when you get it read.

[ALPHA 3.0i Z3]

Ill check tomorrow...if weather permits ....and report back with findings..

[gookah]

mine was down to split intake hose. common fault

[ALPHA 3.0i Z3]

mine was down to split intake hose. common fault

I'll check in morning. Rough idea where to look?
A

[ALPHA 3.0i Z3]

Found it on your build on the 2.8.
Cheers

[deni2s]

Could be bad o2 sensors or anything else. Read the error codes, that's the only way to diagnose without useless speculations.

[ALPHA 3.0i Z3]

Could be bad o2 sensors or anything else. Read the error codes, that's the only way to diagnose without useless speculations.

Quick plug in today....CEL off shows up a missfire on number 4 @ startup. Coil pack or plug?

[bertiejaffa]

Could be bad o2 sensors or anything else. Read the error codes, that's the only way to diagnose without useless speculations.

Quick plug in today....CEL off shows up a missfire on number 4 @ startup. Coil pack or plug?

I would guess at coil - swap it with a different one and see if the fault moves with it

[ALPHA 3.0i Z3]

Could be bad o2 sensors or anything else. Read the error codes, that's the only way to diagnose without useless speculations.

Quick plug in today....CEL off shows up a missfire on number 4 @ startup. Coil pack or plug?

I would guess at coil - swap it with a different one and see if the fault moves with it

Cheers ...bertie....i will do in the week if this **** weather ever stops!!
A

[Wookee]

Could be bad o2 sensors or anything else. Read the error codes, that's the only way to diagnose without useless speculations.

Quick plug in today....CEL off shows up a missfire on number 4 @ startup. Coil pack or plug?

I had this problem on two cylinders and found that the HT lead where it goes into the spark plug cover top had come loose. Mine had been like this for some time it seems as the wires had turned green. I simply trimmed them up and pushed them back in firmly. Might be worth checking that first

[ALPHA 3.0i Z3]

Could be bad o2 sensors or anything else. Read the error codes, that's the only way to diagnose without useless speculations.

Quick plug in today....CEL off shows up a missfire on number 4 @ startup. Coil pack or plug?

I had this problem on two cylinders and found that the HT lead where it goes into the spark plug cover top had come loose. Mine had been like this for some time it seems as the wires had turned green. I simply trimmed them up and pushed them back in firmly. Might be worth checking that first

Cheers wookie..will do.
A

[billysally208]

Easy way to check if it is your plugs - put no 4 plug in cylinder 3 and then see if misfire moves to no 3 - set of plugs will be cheaper than coilpack

[peter2b]

I found or rather Robert T found the air leak on the hose after the maf sensor small ribbed hose under the inlet manifold
peter2b

[Robert T]

Coil pack or plug - the sixes don't have HT leads. LT leads don't degrade like HT leads, but could still fail due to chafing, but much less likely.

Cheers R.

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