Rb20 Misfire

[JiN_MaN]

So I recently got my R32 back (RB20) after 20 months of it not being started. I charged the battery, unplugged the CAS gave it a few cracks and then plug the CAS back in and started it up.

It was running fine 20 months ago, but now it has a misfire on the 3rd cylinder back. Ive changed:

coilpacks between cylinders, nothing changed,

Ive changed spark plugs between cylinders and cleaned them at the same time, no different,

At this point the car wasnt blowing fuel out the exhaust, the sparkplug was dry and in good condition on the 3rd cylinder. Then I pulled all injectors out had them cleaned and tested all 100%, Still no change, but the the car does seem to blow a lot of fuel now unlike before.

Ive pulled the sparkplug out and put it in the coilpack and cranked it over and I can see the spark firing.

As far as I can tell it has spark, it has fuel and it has air.

Suggestions?

Can an igniter cause problems on only 1 cylinder?

Edited September 20, 2011 by JiN_MaN

[GTSBoy]

Can an igniter cause problems on only 1 cylinder?

Absolutely.

Could also be something like a sticky valve or lifter. Might want to do a compression test on that cylinder and one or two others just to check.

[zebra]

Are you 100% sure its #3 even after changing the plugs around? I see you say it has spark, but is it a bright/strong spark?

for 30 bucks I would just chuck a set of new copper plugs in, even if its to eliminate any future problems

[JiN_MaN]

Changed ignitor, no change.

Absolutely sure its no# 3 I can unplug the coilpack and nothing changed. Ill do a compression test and see what happens.

[zebra]

Coil pack loom?

[The Dan]

Ring or valve would be my guess. What was done in the 20 months it was off the road?

[JiN_MaN]

Police took it to investigate and forgot to give it back.

Will do compression test when I find my compression gauge.

If its ring it should still have some sort of compression and if its valve then it should just be a flat 0. Is that correct?

[The Dan]

Police took it to investigate and forgot to give it back.

Will do compression test when I find my compression gauge.

If its ring it should still have some sort of compression and if its valve then it should just be a flat 0. Is that correct?

No, a damaged piston or head gasket can cause a missfire at idle but not when above 1000rpm. Compression could come back 100% as well.

Valve can be the same. RB's aren't well known for carbon buildup on valves or ports but it can happen.

Do the comp, if it's 100%, do a proper leakdown test

[JiN_MaN]

Compression test shows, 133-138 across all cylinders.

[The Dan]

What was the leakdown test result?

[JiN_MaN]

Haven't done a leak down test yet as I can't so it at home. Will have to take it to the mechanical around the corner

[The Dan]

It makes more sense to do a leakdown test at the same time as a compression test. Probably get the mechanic to do a comp test at the same time to confirm your results

[JiN_MaN]

Injector plug was the issue.

When all the way on with the c clip it wont fire. When pulled half way off it fires. So pulled all the injector plugs off and gave them a clean, now running 100%

[The Dan]

Injector plug was the issue.

When all the way on with the c clip it wont fire. When pulled half way off it fires. So pulled all the injector plugs off and gave them a clean, now running 100%

I thought you checked the injectors?

[GTSBoy]

He did, but checking the injectors (as in pulling them and getting them tested) is not the same as making sure they work in the car!!

[The Dan]

He did, but checking the injectors (as in pulling them and getting them tested) is not the same as making sure they work in the car!!

It is the same when I check them