Thanks, I was thinking to check the valves on that cylinder, but that
means taking off the AC stuff, etc. to get the valve cover off, no fun.
Maybe worth it before spending the $$ on the tool. I'll give the spray a
test, though I put on a new set of intake gaskets and torqued everything
correctly.
Here is the method that the manual says I need to do. It seems to be a
common issue that does require a real time code scan tool.
I am thinking that the reading you are seeing isn't cam retard
but actual distributor timing that the ecu is trying to attain.
Below is the text from GM Service manual for 1997 Chevrolet C
Pickup 5.0L, 5.7L, and 7.4L
According to this you don't set the timing but the timing offset.
You need a "Scan Tool" that plugs into the truck and can read
the data from the trucks computer.
Besides from that, it looks like a normal timing procedure.
Setting Timing
Camshaft Retard Offset Test
The ignition timing cannot be adjusted. The distributor may need
adjusting to prevent crossfire. To insure proper alignment of
the distributor, perform the following:
With the ignition OFF, install a scan tool to the DLC.
Start the engine and bring to normal operating temperature.
Important
Cam Retard Offset reading will not be accurate below 1000 RPM
Increase engine speed to 1000 RPM.
Monitor the Cam Retard Offset.
If the Cam Retard indicates a value of 0° ± 2°, the distributor
is properly adjusted.
If the Cam Retard does not indicate 0° ± 2°, the distributor
must be adjusted.
Adjusting Camshaft Retard Offset
With the engine OFF, slightly loosen the distributor hold down
bolt.
Important: Cam Retard Offset reading will not be accurate below
1000 RPM
Start the engine and raise engine speed to 1000 RPM.
Using a scan tool monitor Cam Retard Offset.
Rotate the distributor as follows:
To compensate for a negative reading, rotate the distributor in
the counterclockwise direction.
To compensate for a positive reading, rotate the distributor in
the clockwise direction.
Repeat step 4 until 0° ±2° is obtained.
Turn the ignition OFF.
Tighten the distributor hold-down bolt to 3N.m(25 lb. ft.).
Start the engine, raise engine speed to 1000 RPM and recheck
Camshaft Retard Offset.
--R
On 8/20/11 12:32 PM, Peter Frederick wrote:
Most likely a fuel or ignition problem, although it could be a tight
valve leaking all the cmpression out.
Not familiar with that engine, but those are the most likely.
Also possible you have a bad intake gasket at that cylinder, so it's
sucking air. Easy check -- spray some carb or brake parts cleaner
over the area lightly while it's running. If the miss goes away and
it speeds up, you have an air leak.
Peter
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