Potential Money Shift Mystery (Did I luck up or what???)

[Lexciting]

I have a little mystery going on with my 94 and hoping to see if I lucked up or what on a misshift???

Here is the story:
Car: 1994, refreshed engine, new pistons, ported/polish, comp cam, 1.7 RR, VEC2 tune, etc.

So I am driving normally when I made a mistake (over 25yrs driving manual shift so no flames! was a mistake) and had my hand in the wrong position and downshifted from 4th to 2nd!!!! Mechanical overrev!!! Realized what I did as soon as the revs wents way up and I heard a loud BANG! like backfire as I pushed the clutch in as quickly as I could and put the car in neutral and cruised. The car didn't cut off but when I put it back into gear and gave it gas it hestitated and the revs seem to be boucing up and down while in gear without hitting gas. Once going all the way down in revs. I was close to home so eased it back to the house. Car seemed to drive normally but had a ticking sound that I now noticed and some surging in revs at idle (to the point of cutting off at one point)... Called Tator. He suggested that I reload the VEC tune that I have for my car, which I did. Take the car out the garage and it still surges in revs. Put it back in the garage and ship it to Tators for a Wizard evaluation!

So Tator takes a look. Does leakdown and compression test (all within 4% to 7%), looks at the oil (dirty but no metal), checked valves, changed spark plugs, examines and adjust RRs, amongs the normal things to look for in this situation and...NOTHING. He reloaded the tune and says that there is a little ticking but it goes away after warming up and if I was sure it wasn't like that before (I don't know now...am paranoid I'll admit). He road tested it and says seems strong; no issues.

Any ideas??? Did I luck up? Could that loud bang just been backfire (it came from the exhaust area)? I did get my foot on the clutch but I did overrev and then the BANG/POP! Plus the surging of revs at idle before I shipped it to Tators. Maybe I fried a plug? RR out of wack?

Thanks for any suggestions in advanced.

Lee

[gage]

These engines are pretty loud and have alot of noise. It can be easy to become OCD when it comes to cars but if the numbers are good and the car is performing then play on!

idle rev surge could be something else like IAC motor or as you say spark miss.

[St.Char]

You are in good hands with the Wizard! If there was a problem, I'm sure he would have found it. Nothing unusual about the sound of unburned fuel with the exhaust pop and burble....usually this happens with quick deceleration of the car which sounds like what you experienced. Good luck.

[Lexciting]

Thanks for the replies! Better safe than sorry so I shipped it off to the Wizard! Since the leakdown/compression test show that my engine broke in properly after the engine refresh; I'll have it shipped back and drive it as usual. Hopefully, no issues!!!

[Dajerseyviper]

Could have destroyed a spark plug and the changing of the plugs fixed it..Could be some weird anomaly in the PCM that triggered some weird safe mode..Either way dont sweat it if your mechanic said it was ok..

Was it an exhaust bang or from the manifold? Manifold backfires are usually timing related. Over revving usually floats valves, bending valves or weakening springs. did he check the spring pressure?? another thing it could have been was a lean backfire condition, which sometimes happens during deceleration..

[Lexciting]

When I misshifted, it sounded like a loud gunshot type "BANG/POP!" and seemed to come from the exhaust since it seemed to come from behind me (side exhaust). My cut off on the VEC is set at 6000rpm and I know I went past that when I misshifted into 2nd. I am pretty sure Tator said he checked the values but I'll ask to make sure.

[Dajerseyviper]

When I misshifted, it sounded like a loud gunshot type "BANG/POP!" and seemed to come from the exhaust since it seemed to come from behind me (side exhaust). My cut off on the VEC is set at 6000rpm and I know I went past that when I misshifted into 2nd. I am pretty sure Tator said he checked the values but I'll ask to make sure.

Then it was probably a fuel cut off in the VEC causing a loud "lean backfire"...If he said its good, then its good..