fnbrowning

A couple of weeks ago, I did the idiot shift of 3rd to 2nd while meaning to put it in 4th, at high {not WOT.} Rear tires chirped, fwd end nosedived before I slammed the clutch back in.
I cursed my stupidity, and drove the last mile to my destination.

Three hours later, I started the return drive home. Within a few miles, I got the dreaded SES light, which my AutoTap identified as various misfires, which I understood, and some weird **** like IAC high voltage, and high voltage MAP P0015 B Camshaft Pos Timing-Over-Retarded and others which I did not understand.

The car seem to run fine, and I have hardened push rods, so later in the day, I reset the computer. I went through the dreaded idle/relearn on a cam car. Had some misfires on AutoTap, but many fewer, and they eventually disappeared.

Last week I went on a long highway test drive with the AutoTap, no misfires at all.

HERE’S WHERE MY QUESTIONS START:

I happened to mention to my tuner the incident and the IAC high voltage, and high voltage MAP and other codes I could not explain.

Mr. Tuner is convinced that even though the engine idles normal and there are no misfires, I could have a bent push rod or two. He sez I should pull the valve covers and check.

I say NO because:
It's much harder to bend the Comp Cams pushrods, not likely they are bent.
I’d see some evidence of bent pushrods. Loss of power, worse idle, SES codes, consistent misfire - something.
I say it’s paranoid to pull the valve covers.

Who's Right? What say you?


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1.

mvvette97

iTrader: (18)

I would think if you had bent pushrods you would hear some loud ticking. How does it sound?

jinxedz

iTrader: (5)

Are the valves stock?
Possibility of bent valves?

fnbrowning

Sounds fine.

fnbrowning

Usually the valve is much stronger than the pushrod, so the pushrod bends to absorb the shock. I would say that of all the people who bend stock pushrods due to an overrev, 95% or more have no problems with the valves.

Also, If you have a bent valve, it is much more likely that you will get some kind of tick in the exhaust or pop in the intake.

No codes.
No tick.

brad8266

iTrader: (23)

Your hardedned pushrods are stronger than your valves, once you have hardened PR's and you overrev you can easily bend valves up and it will casue the symptoms you are describing. Id be pulling the heads off if i were you after you check for a bent PR. look for a messed up valvespring too.

SSpdDmon

iTrader: (10)

I'd still take a couple of hours to check things out if you're worried about it. Pull the coils/valve covers and look over everything (rockers, pushrods, springs, etc.) closely. If there's nothing obviously out of place, I'd button it back up - no need to disassemble rockers and check pushrods. It shouldn't take much time to give it a quick visual inspection like that. Might not be a bad time to change the plugs too with everything out of the way.

jinxedz

iTrader: (5)

Wont really be able to check the bent pushrods/valves with everything on the engine ... theyll need to be removed to be examined, which might mean pulling the heads to get to the valves

sounds like a PITA just for a 'check-up', but its the only way to know for sure

brad8266

iTrader: (23)

It takes a whopping 2 hours at the most to pull the PR's and check the valvesprings and reassemble. Pretty easy.

jinxedz

iTrader: (5)

I know, I just did them, im talking about pulling the heads (to check the valves).

brad8266

iTrader: (23)

My post wasnt directed toward you, lol.

fnbrowning

I don't have any symptoms now. . . !
I had weird codes for one day, like: MAP overvoltage, IAC overvoltage, and the P0015 B Camshaft Pos Timing-Over-Retarded
All of which went away after the PCM reset.

The point is, I wasn't worried until the tuner said I should be worried.

No symptoms.
No ticking.

So the LS1TECH hive mind sez I should still pull the valve covers, huh?

PREDATOR-Z

You can do a leakdown test to see if you have bent valves. Bent valves will not seat correctly in the seats and leak can be determined. If something abnormal is detected, then you can proceed to yanking the heads.

fnbrowning

Why should I do it is the question. Would you do it after 1 over-rev where you had no symtoms 2 weeks after?

That is the reason for the thread!

Are you guys suggesting leak-down tests and possible head check after one over-rev?

Have you completely read my posts?????

hammertime

iTrader: (1)

Well, since your original post says who's right, and you obviously care more about being smarter than your tuner, I'll go ahead and say you're right to make you happy.

Aside from that, Predator hit the nail on the head - a compression test and leakdown test would tell you all you need to know without even pulling the valvecovers. But I wouldn't worry much if you have no symptoms of a problem...

fnbrowning

THAT is a revealing, smug, ingratiating, false reply.

This isn't a contest as to who's smarter.
It's a thread as to the level of {caution} {paranoia} I should apply.

Who's right means how much work the LS1TECH hive mind thinks needs to be done.
None / A Little / A Lot

It's not a game. It will determine how much time/$$ I spend.

This isn't a game

4Birdman

iTrader: (13)

I wouldn't check it. But I'm also the kind of guy who likes to break ****.

ss1129

iTrader: (16)

If you had the symptoms and they were physical, the car didnt fix itself. It could be the cpu is good at hiding them in your case, but my motor on stock pushrods doing the same thing as you bent 4 valves. In the end a leak down test isnt going to cost anymore than $40.00 for ease of mind.

WS6nJAX

iTrader: (207)

my opinion is that if there is even the smallest amout of caution/paranoia in your mind, you must decide if you want to be be safe or sorry.
a....you over-reved your car.
b....your tuner suggest that your problems might be related to the mis-shift.
c.....members have also confirmed that it may in fact be a bent p/r or valve.
what else would you like everyone to say?

if there is the slightest chance you may not like the answer, please dont ask the question.

brad8266

iTrader: (23)

You post this and then discredit everyone that tries to help you. You know it all already so why even ask?

Good luck getting it fixed.