The compression test seems like the next indicated thing. After that you could
be looking at pulling the heads for further investigation. If it isn't ignition
related, then it almost has to be mechanical.
Paul
In a message dated 8/23/2004 12:52:59 AM Eastern Daylight Time, "angela
jimenez" <angela_J1s@xxxxxxxxxxx> writes:
>I havn't done a compression test yet but I plan to next weekend. There is no
>sign of coolant in the oil or oil in the coolant. I found that the # 7 & 8
>cylinders aren't firing by pulling the plug wires off one at a time wile the
>engine is running (be sure to wear thick gloves, it can be a shocking
>experence if you don't). If the sound of the engine changed I knew it was
>firing, if the sound didn't change I knew it wasn't. I did pull the plugs,
>they were dirty and wet. Also while I had them out I connected the wire to
>the plug and turned it over, they did spark. I ran the engine for a few
>minutes after I sent the last message and the # 7 & 8 cylinders hit 10 or 15
>times a minute when ideling at about 900 rpm. When I rev it up it drops
>them.
>
>Justin
>----- Original Message -----
>From: <RandalPark@xxxxxxx>
>To: <mailing-list@xxxxxxxxxxxxxxxx>
>Sent: Sunday, August 22, 2004 8:53 PM
>Subject: Re: IML: engine troubles
>
>
>> Have you done a compression test?
>>
>> Also, what test are you doing to determine that numbers 7 & 8 are dead?
>How do you know that they are getting spark? Have you taken the plugs out
>and seen that they have been firing? If they still look brand spanking new,
>they haven't fired. If they are firing, then there could be a valve problem,
>piston problem, cracked casting, or broken head gasket. These would show up
>as very low or no compression on those cylinders.
>>
>> If there is a cracked head or cylinder block, you may see bubbles and/or
>oil in the radiator, or even a loss in coolant while the engine is running.
>There could also be coolant in the crank case. A blown head gasket could
>also cause these things.
>>
>> Broken pistons and burned valves have other unmistakable symptoms all
>their own.
>>
>> Paul
>
>
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