Any Guess? Engine problems

1734 Views 6 Replies 4 Participants Last post by j-tek, Oct 8, 2013

Twindragon

Discussion Starter · Sep 25, 2013

So today on the way home from work the car started running really rough, almost to the point of stalling. I mananged to get her home and even had codes checked (check engine light came on after). Codes:

Knock sensor
3rd cylinder detonation (knock?)

I pulled the sparks and 3 looked like this:

The third cylinder looked like this:

Background info:
recently replaced the battery. Alternator was replaced 6 month or so ago.

What are everyone's thoughts?

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ferrari21

· #2 · Sep 25, 2013

You're very lean on 1 cylinder. Probably an injector going bad or not working.

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Dane

· #3 · Sep 25, 2013

You need to isolate the cylinder, then determine if fuel or spark problem. While running pull the plug wires one at a time and note change in idle. Then do the same with injectors. Did the engine shake at all?

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Twindragon

Discussion Starter · #4 · Sep 25, 2013

I'll try that Dane. I can tell you it shook prior to me trying this but i'll report back.

Is there an easy way to get to the injector caps when you have a the high upper manifold engine?

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Twindragon

Discussion Starter · #5 · Sep 26, 2013

pulled out the cables while the car was running. Small changes from1,2,4 not much of a change from 3. My guess would be the injector. I tried taking off the cap but the damn thing wont budge. any tips?

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Twindragon

Discussion Starter · #6 · Oct 8, 2013

Just for future reference. The Injector was toast. It didn't even register on an OHM test. Replaced and everything is ok.

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j-tek

· #7 · Oct 8, 2013

yup.. good troubleshooting skills.

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