Someone help
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Someone help ok, a freind of mine has a 94 Z28.. It has a constant dead miss that will clear up every once in a while.. not very often.. when it clears up it lasts maybe 5 min.. We changed the opti, coil, and wires.. thinking it was ignition.. no.. same thing happens.. It also gets about 5 mpg.. on a good day.. we took it down today and had it scanned... all the mechanics told us was that its dumping insane amounts of fuel.. and it "needs an air pump" to run right.. which i know is BS.... also told us it needs cats to run right.. lol.
We just cant figure out why it would be dumping so much fuel.. even when its running.. you can smell the raw fuel that is being dumped.
We just cant figure out why it would be dumping so much fuel.. even when its running.. you can smell the raw fuel that is being dumped.
On The Tree
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From: Naperville
You might have an injector that's stuck open or an exhaust leak before the o2s thats making the car think it's running lean so it adds more fuel. Plug the air pump wholes on the manifolds and see if that fixes it.
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Originally Posted by stik6shift93
You might have an injector that's stuck open or an exhaust leak before the o2s thats making the car think it's running lean so it adds more fuel. Plug the air pump wholes on the manifolds and see if that fixes it.
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Originally Posted by Gloveperson
I am guessing you had it scanned for codes so the 02 sensor thing would have come up.
This definatly sounds like a fuel isssue. Check the injectors is my best bet.
-Todd
This definatly sounds like a fuel isssue. Check the injectors is my best bet.
-Todd
Bad injectors? or bad computer? if the injectors were bad would the car run at all? It definately is a fuel issue.. there is tons of fuel being dumped.. even at idle.
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Originally Posted by stik6shift93
If an injector or 2 were seized open and constantly spraying the car would still run but like complete crap, you would also be able to find gas in the oil. Did you pull any other codes?
Trying to figure out how i could tell if one was seized open... it smells and runs like its spraying fuel all the time.. also floods out and almost dies when stopping.
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Originally Posted by dhdenney
Swap injectors out of your cars. The LS1s are different yes but at least you know they're ok. Would give some indication to the status of your bud's. My .02 anyway.
good idea.. i didnt know for sure if they would work in the lt1 without a reprogram.. ill try that though.
The LS1 injectors will pobably make matters worse for you. Without programming for it they will dump to much fuel into that cylinder and your problem wont go away (if the injectors are even the cause).
Have you tried unplugging the maf? See what it does in "speed density" mode. You may have a vacuum leak somewhere... a bad EGR? Unplugged port somewhere... If the 02s are picking up air that hasnt been metered it could be dumping more fuel to compensate and its purposely flooding itself. Just a thought.
Have you tried unplugging the maf? See what it does in "speed density" mode. You may have a vacuum leak somewhere... a bad EGR? Unplugged port somewhere... If the 02s are picking up air that hasnt been metered it could be dumping more fuel to compensate and its purposely flooding itself. Just a thought.
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Originally Posted by S8ER95Z
The LS1 injectors will pobably make matters worse for you. Without programming for it they will dump to much fuel into that cylinder and your problem wont go away (if the injectors are even the cause).
Have you tried unplugging the maf? See what it does in "speed density" mode. You may have a vacuum leak somewhere... a bad EGR? Unplugged port somewhere... If the 02s are picking up air that hasnt been metered it could be dumping more fuel to compensate and its purposely flooding itself. Just a thought.
Have you tried unplugging the maf? See what it does in "speed density" mode. You may have a vacuum leak somewhere... a bad EGR? Unplugged port somewhere... If the 02s are picking up air that hasnt been metered it could be dumping more fuel to compensate and its purposely flooding itself. Just a thought.
right now we're just trying anything we can think of.. lol
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I thouhgt that the lt1 and ls1 injectors were basically the same, just that they two systems run under different pressure? 43.5 for the lt1, and something higher for the ls1?? With the lower pressure in the lt1, i think a 26 or 28 lb ls1 injector would be close to 24. ---remember hearing this from 2fast4lv, i think
Stock LT1s are 24lb, and stock LS1s were 26 (1998) and 28lb (1999+) (Pretty sure on that)
If you put different size injectors in the pulsewidths are for the 24lbers (I dont think it "knows" how much its spraying..but more or less tuned for the specific injector.)
So with a 24lber its spraying 70% (just a random number I made up).. if you put 28lbers in, it still thinks it is firing 24lbers and sprays 70%. Which is obviously too much.
This could be wrong... however I believe you need to program for injectors or it doesnt respond well at all.
I do see your explanation..and it makes sense...so I might be completely retarded as well. LOL
If you put different size injectors in the pulsewidths are for the 24lbers (I dont think it "knows" how much its spraying..but more or less tuned for the specific injector.)
So with a 24lber its spraying 70% (just a random number I made up).. if you put 28lbers in, it still thinks it is firing 24lbers and sprays 70%. Which is obviously too much.
This could be wrong... however I believe you need to program for injectors or it doesnt respond well at all.
I do see your explanation..and it makes sense...so I might be completely retarded as well. LOL
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Originally Posted by dhdenney
Maybe what I said wasn't a good idea. But if you both had LT1's then it's a great idea. 
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Someone Help Rev. 2.0.. lol Ok.. Figured this one needed a new thread..
about the 94 camaro.. as being discussed in the someone help thread.. well today when we put the ls1 injectors in.. didnt help much.. we took a look at the plugs and found that #8 was covered in oil and grease. not good.. then looked at the plugwires and #8 is burned in 2 places almost in half.. the others just about all of them are burned in at least one spot.. all the way to the core.. you can see the fibers.. The wires are only a month old.. Probably found most of the problem.. Now how do we keep the damn wires off the longtubes?? SPecial wires? special looms or something? Thanks
about the 94 camaro.. as being discussed in the someone help thread.. well today when we put the ls1 injectors in.. didnt help much.. we took a look at the plugs and found that #8 was covered in oil and grease. not good.. then looked at the plugwires and #8 is burned in 2 places almost in half.. the others just about all of them are burned in at least one spot.. all the way to the core.. you can see the fibers.. The wires are only a month old.. Probably found most of the problem.. Now how do we keep the damn wires off the longtubes?? SPecial wires? special looms or something? Thanks