First question: does the fuel you buy contain an oxygenate? We used to
have it here in NC 'til everyone started complaining of engine knock, and
again after having to have major repairs since the detonation will destroy
bearings. Great for emissions, bad on engines.
Second: How much total advance does the computer allow? My '92 max's out
at about 3500 rpm and from what I can figure, spark advance stops in the
early/mid 20 degree range. I get some knocking from 4200 to the shift rpm
at 4800 during WOT. It's worse in the winter since the air is colder and
thus more dense. For some reason I can't explain, the computer isn't
sensing the denser air and isn't adding fuel to the mix so in the higher
rpm's, it will lean out a bit. I've rotated my distributer a bit to have
and initial advance at 12 degrees BTDC. After a few minutes the computer
compensates.
Smitty - KF4UQY
Raleigh, NC
-----Original Message-----
From: acasey@io.com [SMTP:acasey@io.com]
Sent: Friday, December 12, 1997 4:51 AM
To: dakota-truck@buffnet.net
Subject: DML: Detonation
Another tech question for the list.
I have started noticing my engine detonating badly as I approach 5000
rpm. This is a serious problem that will keep me off the track this
weekend. So instead I will be spending Saturday in the driveway
trying to isolate the culprit. I plan on doing the following, so if
ya'll can think of anything else to try or look for please let me
know.
1. Check all the plugs and plug wires.
2. Check rotor and distributor cap, (there only about 6 months old).
3. Disconnect my MSD and switch back to the stock coil.
4. Check fuel presure
5. I plan on reading up on adjusting the distributor position in the
Haynes manuel, and then try playing around with it.
6. I guess I could try a lower temp thermostat, but the engine is not
getting hot.
Maybe some of our Supercharged members have run into this before???
Anyway any help would be appriciated.
Alan...
94',SLT,V8,5spd,MP SBEC,Flowmaster,SureGrip,MSD w/blaster
coil,Pulleys,1.7 Roller rockers,Super Street TBI,Taylor
wires,Chanpion truck plugs gapped at .40
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