Pinging After Cam Install?
 

what could cause pinging after my cam install? A good shop did my install, now they are trying to find this out, what could it be that is causing the problem.

Car has new wires, plugs, opti. Has steady fuel pressure. The only mods are headers and lt4 hot cam. When the car is given 1/2 throttle it will ping. Can the timing be off possibly..what other ideas.

-Corey

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Electron Blue '94 Trans Am w/ '98 Front End

!CAGS, Hooker LT Headers Ghetto Intake, Drilled/Slotted Rotors, Shortened Shifter w/ B&M Polished T-Handle, SLP Ram Air H.O. Hood, 17x9 Firehawk Wheels, Blue Taylor 8mm Custom Length Wires w/ Made For You OVC Wire Looms, 5" Autometer Tach w/ Shift Lite, 2 1/6" A/F Guage In Vent, 2 1/6" Digital Oil Temp Guage In Vent.

Latest mods finished: Stock replacement timing chain, new opti, lt4 hot cam kit, custom y-pipe, stock ss/ws6 catback (99+ style).

TTT.

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Electron Blue '94 Trans Am w/ '98 Front End

!CAGS, Hooker LT Headers Ghetto Intake, Drilled/Slotted Rotors, Shortened Shifter w/ B&M Polished T-Handle, SLP Ram Air H.O. Hood, 17x9 Firehawk Wheels, Blue Taylor 8mm Custom Length Wires w/ Made For You OVC Wire Looms, 5" Autometer Tach w/ Shift Lite, 2 1/6" A/F Guage In Vent, 2 1/6" Digital Oil Temp Guage In Vent.

Latest mods finished: Stock replacement timing chain, new opti, lt4 hot cam kit, custom y-pipe, stock ss/ws6 catback (99+ style).

I resently installed an LT4 Hotcam and we had some bad pinging at ~2000RPM come to find out the rockers needed adjustment. Turn the crank manually and tighten the rockers one by one as the come up 2/3 of the way. Hope this helps but it may not be your answer.

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94 TA 25th Anniversary
Moroso CAI,Vortech Elbow,Ported MAF,MSD box,100 Shot NOS N20, TPIS Headers & Y-Pipe, FLO catback 3inch, 4L60-E w/shift kit, 160 stat, Crappy Tires
12.89@110.2

Could they have installed it a tooth advanced?

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1987 Flame Metallic Red IROC-Z Camaro. LT1 motor installed. http://home.attbi.com/~markolc

they just checked the timing cover, and the timing is right on. The roller rockers not being tightened right could cause this problem?

thanks,
corey

Audible ping - like marbles in a tin can? That is not good. Hook up Diacom/TTS/whatever and monitor your knock retard and O2 read outs. If you are running excessively lean, it'll knock. If the car is pulling 15 degrees of timing (max) and it's still pinging, there is something majorly wrong - cam timing definitely comes to mind as does misadjusted rockers.

-Alex

i know the post is not at the top..but yes the ping is audible. Roller Rockers might not be tightened right?

I hope its something as simple as that.

-Corey

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Electron Blue '94 Trans Am w/ '98 Front End

!CAGS, Hooker LT Headers Ghetto Intake, Drilled/Slotted Rotors, Shortened Shifter w/ B&M Polished T-Handle, SLP Ram Air H.O. Hood, 17x9 Firehawk Wheels, Blue Taylor 8mm Custom Length Wires w/ Made For You OVC Wire Looms, 5" Autometer Tach w/ Shift Lite, 2 1/6" A/F Guage In Vent, 2 1/6" Digital Oil Temp Guage In Vent.

Latest mods finished: Stock replacement timing chain, new opti, lt4 hot cam kit, custom y-pipe, stock ss/ws6 catback (99+ style).

Just did a hotcam install also and have pinging.
Did you figure out what your problem was?

What should the numbers read for the o2 sensors when hooking up scanner?

You need to scan the car and get some o2 readings and knock readings. Sounds like a lean detination problem the worst stress to put on a motor. Be easy on it or else you might have to do a head gasket. Is there any chance you got bad fuel. Down here in Miami/Fort Lauderdale its not to un common to buy water!:mad:

After my recent cam install i heard pinging too! I think it's only on the right side of the engine. But the knock count wasn't moving. I'm hoping the sound is a misadjusted rocker.

Would that cause ping as in detonatin? Or would that just be a valve closing too hard and making a pinglike noise?

Well if its in the rockers it normaly sounds like CHATTER or TAPING why not pull valve covers and check valve lash. I just broke a rocker stud and thought it was a stuck valve.:confused:

Possible, althougth I have since filled the tank and put about 65 miles on her and still pinging.
Think I may have to pull the timing cover off to check the timing, which I am not looking forward to.
Question, if the opti is turned before putting it on, but as long as the teeth line up with the spline would it matter that the opti was turned?

rockers.... its all in the rockers ;)

Wouldn't I hear them tapping? I wish it where the rockers, but somehow don't see how it could be them...but I guess I have to have it checked out.

Something you might want to check is the EGR tube. Mine didn't seal properly after reinstalling things, and I picked up a really weird kind of clattery sound that wasn't always present, but most often was. Once I resealed the EGR tube properly all was well.

check the opti, friend did a cam on his 94Z, had detonation, ripped it all down, checked everything over, ran it half apart, was fine, put it entirely together, detonating again.

end result? the opti was overtorqued when it was reinstalled and cracked the housing, that let moisture in and boom...there's the detonation.

would only detonate when you got on it hard, if you rev'd it easy up to redline, no pinging.