My friend has an '89 RS TBI that pings really bad when the engine is under load, like going up a long hill. Also at times it will make a noise like a ping but really fast almost a grinding noise and puff a little smoke... whats causing this? Timing?

Thanks

 

either hes using bad gas (below 89) or his timing is advanced past 0*BTDC.

 

Run some combustion chamber cleaner through it, Gumout makes some good stuff for it. Then run a few tanks of 91 octane. he might have had some bad gas...

 

It may be bad timing, bad (not just low octane) fuel, or maybe a restriction on the exhaust, like a clogged catalytic converter.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

Yes, the timing should be checked 1st, thats what it usually is, but not always.

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Looking For:

87 IROC-Z 350 TPI
84 TRANS AM 305 H.O.

[This message has been edited by IROCZTWENTYGR8 (edited February 23, 2001).]

 

Timing, bad gas......when was the last time you gave it a tune up??

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92 Camaro RS LO3, 5-spd, T-tops
Performance:
SLP 1 3/4" Headers (Coated by Paul Barry Motorsports), Flowmaster Catback Exhaust, Fastchip Performance PROM, Centerforce Dual Friction Clutch, Xact 8mm wires, Open Air Element w/K&N Filter, Z28 Grille w/aftmkt fog lamps
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, Edelbrock performer intake

 

Or a bad head gasket.

 

I'll check the timing first. It has a new exhaust system with no cat so I don't think thats it. If the timing is ok I'll run some cleaner and some high octane fule and see what happens.

Thanks

 

Isn't there something also about carbon buildup inside the EGR valve can cause pinging at low rpm/high speed engine operation? Or am I just thinking of port-fuel-injection?


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
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