Ok, I need some real good help. My 02 has been pinging at acceleration only for about 2 mnths now. I've alway used 91 octane(Highest Octane in Cali). Prior to taking it to a Corvette Specialist, I used two bottle of Chevron Techtron fuel system cleaner. No luck, pinging still an issue. I finally took it to a Corvette specialist. 1st step was using the Seafoam by applying it thru the PVC hose. No luck, pinging still an issue. 2nd step, use a bottle of RedLine Fuel System Cleaner, which the specialist stated the mechanic that builds LS1 engines swears by it. I put a bottle of the Redline in the tank and filled up. well needless to say, my tank is almost empty and the pinging is still an issue when I accelerate. Per the specialist, the next step would be to replace the spark plugs. Keep in mind, each time I've visit the specialist, I'm being charge for the diagnose. Question, will changing the spark plugs actually eliminate the pinging issue? They're thinking of replacing the stock plugs with a cooler plug. I need help.

Also, my check engine light did come on this past Saturday. However, the codes were 0171 bank 1 and 0174 bank 2. No codes regarding the Nock Senser. He re-set it light went out. I informed the mechanic that I'd recently cleaned the MAF. He stated, a little of the oil from the cleaner may have still been on the MAF. He suggest, if light comes back on, to bring it back to him to if he gets the same codes. If so, may need to change the MAF. Can the MAF Sensor be going bad W/O sending a code and setting off the Check Engine Light?

Thank You!

 

Stock motor, stock tune ?

 

I'd take it to somebody else. Replacing the plugs with a colder set isn't the answer. If it just started doing this, what changed when this happened? Was you working on it or somebody else? Sounds like it's running lean. What's the fuel pressure? Leaking intake duct, or manifold? 02 sensors switching properly?

 

Yes,Stock motor, stock tune. However, I do have an after market air intake(Blackwing), but this came already install when I purchased the 02 in 12/2013. I did have to replace the Cats last summer.

 

what changed when this happened? Nothing changed as far as I can tell. No, no one was working on it. Sounds like it's running lean. Yes, I believe it's running a little lean. As I mentioned, when the Check engine light came on, I took it to my mechanic that does work for me on my Toyota. He couldn't get a reading using the hand held diagnose computer. However, when he hook it up to the large computer diag computer, it registered the codes 0171 and 0174 bank 1 and 2. Not sure What my fuel pressure level is. My mechanic looked for leaks, but stated he could not find any. So far, the light has not come back on. However, it's just been a couple of days.

 

If you're anywhere near Oxnard, take it to A&A Corvette. Andy will get it right. Or Charlie at RPM in the valley, he knows his stuff.

 

If I understand the sequence of events, you had cleaned the MAF before this started happening. What did you use to clean the MAF? Was it a non-residue electronics cleaner? If not, I would get the non-residue clean and do it again. Wait for the light to come on first, then re-clean. The fact that it is both banks makes me think somewhere in the intake tract. The dirty MAF also won't throw a code, but if there is residue on it it may not be providing the correct signal.

 

I didn't see the part where you cleaned the MAF sensor. You may also have an air leak between the MAF and the intake, that'll make it run lean, because the MAF isn't measuring all the air going thru the engine.

 

If you're anywhere near Oxnard, take it to A&A Corvette. Andy will get it right. Or Charlie at RPM in the valley, he knows his stuff. Unfortunately, I'm not. Any other suggestions?

 

I used the CRC Mass Airflow Sensor Cleaner. Any answers on the pinging Issue I have?

 

If changing the sparkle plugs is not the answer, why would they make such a suggestion? Maybe they're fishing, perhaps?

 

There are a couple of clues here. PO171 & PO174 are lean codes. You also state that pinging occurs under acceleration.

If your fuel filter hasn't been changed, I would start there. Your 2002 fuel filter has an integral fuel pressure regulator.

I had a very similar issue (I'm in Cali too) and changing the fuel filter solved the ping issue.

 

YES, your running LEAN which increases combustion chamber temps, really bad cases can MELT things like pistons. So figure out where the unmetered air is coming from. I'm betting on the blackwing not installed correctly!!

Where do you get "SPARKLE PLUGS", the tooth fairy?

 

Go to auto parts store. Rent fuel pressure gauge. Determine fuel pressure. If bad, replace fuel filter and retest. If good, likely intake side of things.

 

I have 74 Chevy pickups and vans at work and we are convinced that a bad lean condition will kill a Chevy motor fast.

 

[QUOTE=eevette2001;1589219316]YES, your running LEAN which increases combustion chamber temps, really bad cases can MELT things like pistons. So figure out where the unmetered air is coming from. I'm betting on the blackwing not installed correctly!!

Where do you get "SPARKLE PLUGS", the tooth fairy? I haven't changed the spark plugs, yet. However, the mechanic pulled one and stated, a little warn, but still in decent condition.

 

[QUOTE=zone-7;1589218893]There are a couple of clues here. PO171 & PO174 are lean codes. You also state that pinging occurs under acceleration.

If your fuel filter hasn't been changed, I would start there. Your 2002 fuel filter has an integral fuel pressure regulator.

I had a very similar issue (I'm in Cali too) and changing the fuel filter solved the ping issue. I thought about that. I'll mention it to the mechanic.

 

[QUOTE=NJD;1589222113][QUOTE=eevette2001;1589219316]YES, your running LEAN which increases combustion chamber temps, really bad cases can MELT things like pistons. So figure out where the unmetered air is coming from. I'm betting on the blackwing not installed correctly!!

Where do you get "SPARKLE PLUGS", the tooth fairy?:crazy

I haven't changed the spark plugs, yet. However, the mechanic pulled one and stated, a little worn, but still in decent condition. As far as the possibility of the incorrect installation of the Blackwing, nope not the case.

Thanks for suggestions.

 

[QUOTE=dbgoodwin;1589219986]Go to auto parts store. Rent fuel pressure gauge. Determine fuel pressure. If bad, replace fuel filter and retest. If good, likely intake side of things.

I'll try that. What's the correct fuel pressure?

Thanks!

 

58 psi

Ron