im haveing a missing under a load problem i have a 92 camaro with 383 tpi "lt1 intake" ive erlaced wires cap rotor plugs and put different injectors in and it still missing i cant really notice it at idle but if i rev it up fast i can hear it or if i go for a drive i can hear and feel it kick in and out if i step on it it might miss them hit on all 8 then miss again fuel pressure good o2 reading good and ideas? any at all? please help thanks

 

If it's your ignition, you should be able to see it with a timing light. Mine was missing intermittently like yours, and it wasn't until I checked each cyl. that I found it missing on # 3. Turned out to be a cracked reluctor.

 

This is the same car that you have reported it being way too rich. Then way too lean. Now it misses all over the place too. And you're running an off the shelf chip.

It all makes perfect sense to me, i'm not sure what your boggle is.

 

the rich lean condition was all in the o2 as for the miss its nothing to do with the chip i assure you of that i love this board but it aggravates me when everyone wants to tell you to burn your own chips yes i can see where the benifit is and i intend on doing it jus right now i havent got the time to get into it im not trying to be an a$$ its jus everyone points to the chip right away ive been dealing with ed for four years now and hes done me good so until i get the time hes my only option thanks and sorry for sounding like an a$$

 

So the rich / lean problems both just went away with an O2 sensor change?

OK, well a more important question then would become, when did this miss start? I'm sorry, but i am completely confused as to when / what you have been changing. Start from the beginning, when is the last time that the car worked perfectly normally? Then what problem started, and what caused that problem? Etc.

 

the rich condition was from me wiring the heated o2 wrong the 2 connecters i used were pinned differently i figured that out the it was running lean that was due to the sensor being bad i replaced it and air fuel is great now but the miss is still there it was the there the whole time i jus got the other probs fixxed and this is the last one i thinking it might be a bad ground somewhere i had the 165 ecm last year now im running the 7730 i switch so many things this winter is why its so hard to nail down i normally try to do one mod at a time so i can fix anything that might pop up from it but this winter i went to 7730 ecm cc305 cam holley tb new 30# injectors im going to go check grounds now thats only thing left i can think of im running all msd ignition ive checked the coil im sure its something minor its jus finding it i dont think its my msd cause ive had a msd go bad before and jus quits all together
thanks for not taking me wrong earlier im not trying to **** anyone here off the boards are to vaulable to me so sorry and thanks later

 

Could be a problem with valve-lash, valve-springs or a bad lifter. You may end up having to check those things.

 

ive narrowed it down its #1 and #2 not firing the fire sometimes "front 2 cylinders" they cut in and out iand its at idle 2 i started car ran for a bout a min they dripped water on header front 2 jus had a slight hiss while all the other instintly evaperated what would cause front 2 not to fire all the time? i ve check grounds and did compression test its all good there any ideas?

 

maybe your magnetic pickup in the distributor. do you have a known good distributor? if so, i would put that on there.

how do you like your lt1 intake. i got one off of a 94-96 corvette. it is on my 355, which may grow in cubic inches and will become turbocharged.

thanks
anthony

 

its the dis i ran last year it sat on floor all winter that was gonna be my next thing i look at its my orig with 140000 miles on her i jus didnt think there was anything in there to cause a miss i thought if anny of it went bad it jus wouldnt run am i wrong? i ove my lt1 no probs out of it got 15-20000 miles on it with no probs

 

it wont run at all if the module fails, but if your pickup teeth are somehow worn dorn (ie debris) on the 1 and 2 cylanders that could cause the mis. also, heat will cause some pretty wierd running problems when electrical components go out.

thanks
anthony

 

thats why i was starting to think it was the dis since its #1 and #2 and they are right next to each other on the dis i thought it could be something in there i jus get tired of buying things and it not be my prob gets expensive lol ill try it tomrrow i go buy a new one unless someone has any other ideas thanks

 

Yeah, those 2 really don't have anything in common besides being next to each other on the distributor.

Here's a though, but you could also eliminate the injectors by swapping in the old ones and the stock chip. 5 miinute job on the LT1 intake. Unless you don't have a stock chip. i guess. Like you said, best to do one thing at a time, unfortunately you didn't get that chance with all the work you did over winter. But injectors are so easy to switch, couldn't hurt.

I guess now isn't the time to point out how the adapter method of swapping 165 to 730 could dhave also bought you easy reversal to check problems.

Thats my best suggestion if you aren't trying to throw money at it. Reverse the things you can easily reverse, and triple check everything you messed with.

 

i totally forgot that he said that he swiched ecm's.

do they miss all the time or just every now and then?

thanks
anthony

 

i think its now and then im resealing the intake now if thats not it i dunno what it is i replaced distbuter to im lost later

 

FWIW, I had a similar miss when I put
on a EFI single-plane intake. After all
was said/done (==$1000 troubleshooting)
I figured out that the way I plumbed the
PVC into the intake, it was sucking oil from
the valve-covers and spraying it right into
#4,#6 cylinders. It was only detectible
at high vacuum levels when the most
oil was being pulled in.. Since you have
an LT1 intake, I'm not sure how all this
relates, but double check the intake
gaskets to the heads, and any PVC
lines into the intake..

mike