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-   -   Engine has either a dead cylinder or severe misfire under load (http://www.hotrodders.com/forum/engine-has-either-dead-cylinder-severe-misfire-under-load-222760.html)

tylerwerrin 08-10-2012 04:17 PM

Engine has either a dead cylinder or severe misfire under load
 
1995 Camaro Z28 w/ T56 Powering a 1984 Jaguar XJ6

Hi guys,

Ugh, this engine has fought me every step of the way. As soon as it's driving and I'm moving onto the next step, some other problem rears it's head.

Here's the new problem for today:

This morning I drove it about 20 miles to work a job off campus, and everything was OK. On my way back to the office, i noticed the car started vibrating more in the lower RPM ranges while on the freeway. It almost felt as if I had a severe tire out of round, or something along those lines. However, the tires were brand new. I revved the engine a few times in neutral and felt that the engine had a vibration that wasn't there before, like it was missing. However it wasn't intermittent -- it was constant, like nothing is firing at all.

I pulled over, inspected the tires -- everything looked ok. I revved the engine in neutral a bit and it seemed a bit better. However, as soon as I got on the road under load, the vibration would be much more noticeable. I had to get back to the office so I drove the car back -- it made it back OK. I noticed that the RPMs seemed to be smooth enough at idle -- no HUGE vibrations, nothing more than usual anyways.

I took the car home and drove it around the block with TTS datamaster running. The results I got back were wierd:

https://dl.dropbox.com/u/24984984/aug%2010-3.uni

Anyways, if anyone has any ideas of what to check for -- I pulled the injector clips and noticed that two of the cylinders seemed to have no effect when I pulled them off -- one POSSIBLY had a slight effect on idle, but it was hard to tell. The other felt like there was no change (these were Cylinder 1 & 4 respectively... cylinder 4 had the "slight" change.)

Any help would be appreciated -- i don't get why it would suddenly konk out like this!

Eric63M 08-10-2012 11:32 PM

I sent you a PM.

Do you have any data logs of when the engine was running good?

Eric63M 08-11-2012 04:22 PM

Had a bit of time today and went over the data log quite a few times. Did you tune this car yourself also?

One bank is running pig rich and it looks to be missing. Are your plugs and wires all still ok?

What all are the mods done to this engine? It will make it a bit easier to read.

Also at frame 3196 your injector duty cycle is showing 554.4% on the same side its running rich.


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