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Oil is dissapearing...not so bad now, but driveability issues now!
Posted 27 February 2004 - 10:36 PM
Originally posted by WJM
Thru out the whole band, i get hops and skips and detonation for no reason ever once in a while...like every 400 rpm increacement.
Lubricating oil is very low octane -- worse than kerosene. If you get it in the combustion chamber, enough of it alone can cause detonation. If you bring up the boost and that triggers additional blowby and blows oil into the PCV system, then a second or two after boost you might hear pinging plus see some blue smoke.
The 4800 RPM topout does sound like a plugged cat to me. The simple way to check is to take out the O2 sensor, lay it to one side, and drive it. If you feel a noticeable difference, then you know where the problem lies.
I've got access to one of those 5" WC gauge sets for checking for exhaust restrictions, its adapter screws into the O2 sensor hole, but it's just as easy to just briefly drive around with the O2 sensor out to do a quick seat-of-the-pants check.
Posted 27 February 2004 - 10:46 PM
I guess we will see during tomorrow's commute. 28 miles of high speed interstate, followed by 20 miles of intermediate driving.
Edit: oh, the PCV system consists of two 5/8" hoses, one from each cam case cover, teed to a single breather filter. The PCV valve plugged, and this SPFI block doesnt have the rear PCV vent, like the proper turbo/mpfi blocks have.
Posted 27 February 2004 - 10:53 PM
Assuming this is the 9.5 short block and not the 7.7 the compression ratio is kind of disheartening. sounds like its time for new rings and valves.
Posted 28 February 2004 - 07:05 PM
Posted 28 February 2004 - 07:31 PM
Anyhow, that exhaust to way too loud for this neighborhood...time to fix that other exh, and put it back on....and change tires. i dont need no sticking 175/80/13 snow/mud grippers now! Back to the 205/60/13 ultra grippy Tarmac tires!
I just need for it to hold together until i get the DL on the road...one more week...hold together...
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