Try steps 1 and 3 from my write-up below. If it still pings then do all of the steps.
Mopar Combustion Chamber Cleaner Write-up.
Mopar Combustion Chamber Cleaner
(Cleaning carbon build-up from engine)
Parts Needed:
-1 can of Mopar Combustion Chamber Cleaner\2 cans if performing STEP 2 (available at local Chrysler dealer...$7 per can)
-New set of spark plugs(optional)
-Correct amount of new engine oil(ONLY if performing STEP 2)
-New oil filter(ONLY if performing STEP 2)
-Toothbrush
-Clean rag
-Long thin tube(I bought a funnel that came with a long thin tube connected to it at Pep Boys...will come in handy in STEP 2)
-(1) Bottle of Redline Complete Fuel System Cleaner(PepBoys, Autozone)
NOTE: Total time should be 60-90 minutes. This includes waiting time.
*If performing STEP 2, I recommend doing this entire procedure at the time of your next oil change only because I advise changing engine oil and filter afterwards.
Also, before doing anything, a good idea is to first loosen up the spark plugs and then re-tighten them back ONLY to a snug fit(not too tight). This will make life a lot easier when removing the spark plugs in STEP 2.
1). Cleaning carbon from throttle body, intake manifold, combustion chamber and valves:
Start the engine and let it idle or take the Jeep out for a drive until it reaches normal operating temperature(engine should be hot). Turn off engine. Remove the air hose from the throttle body. With engine OFF, spray some Mopar CCC onto throttle plate(not too much) and linkage and clean off carbon using a small tooth brush(make sure you clean the bottom of the throttle plate also). Wipe off dissolved carbon with clean rag……should shine like new. Start the engine(make sure it's hot) and spray the entire can of Mopar CCC into the throttle body….the intake manifold vacuum will suck it in. You may have smoke coming out of the tailpipe during this, and your idle may drop or even try to stall…..this is normal. It’s important NOT to rev the engine during this but to keep a steady idle around 1000-1200 RPM by controlling the idle with your hand on the throttle body spring pack(a glove may come in handy since the throttle spring pack may be hot). When can is empty, shut off the engine IMMEDIATELY. Reconnect the air hose to the throttle body.
*If you are NOT performing STEP 2, then wait 20 minutes before performing STEP3.
2). Cleaning carbon from the pistons:
Remove the spark plugs and spray half a can of Mopar CCC(divided evenly) into the cylinders through the open spark plug holes. If you have trouble spraying into one of the plug holes, try using a funnel or small tube to guide the cleaner into the plug hole or else try to aim as best you could. Reinstall plugs then give the engine a few QUICK cranks(a couple of seconds each time) to mix up the cleaner(DO NOT TRY TO START THE ENGINE WITH FLUID IN THE CYLINDERS). Wait 30 minutes then remove the spark plugs. QUICKLY crank the engine over a couple of times(again, a couple of seconds each time) to eject any excess cleaner out of the open plug holes to help prevent possible hydro-lock. Might be a bit messy but important. Reinstall original plugs.
3). Start the engine(may need to fire it up a several times). Once started, DO NOT let it just sit and idle or else the carbon will just re-cook in your engine. Rather, rev the engine to 3000-3500 RPM's 10-15 times repeatidly. Again, don't be surprised if you see A LOT of smoke...it's normal. Take the Jeep out and drive it hard for a few minutes. This will do a good job of cleaning out any excess carbon from the engine. Afterwards, I stopped at a gas station to refill and pour in a bottle of Redline Complete Fuel System Cleaner. This does a nice job of making sure everything is nice and clean(not absolutely necessary but I thought it would be a good idea).
4). Install new spark plugs if you decided to get a new set. If STEP2 was peformed then change engine oil and filter since the cleaner may have passed by the piston rings.
*Result...Clean throttle body, intake manifold, valves, combustion chamber and pistons.
*Bonus*...NO MORE PINGING!(unless you have another issue).
jeepzj please copy/paste from other forum,no direct links.Mark
[ August 16, 2003, 03:49 PM: Message edited by: rugerman1 ]
The ping is worse now! It pings hard with super unleaded 91 octane. What is the best additive to clean carbon out of combustion chambers that's easy to use, like a gas additive. I don't want to sea-foam the beast because you have to let it sit in the cylinders etc. overnight and just getting to the plugs on his truck requires taking the front wheels off and all kinds of other junk. Screw that. Any advice? Gracious
