97 lt1 missfire on #7 i need help!
So yes ive searched and searched and read for days and days. Ive Googled ive yahood wut ever you want to call it and still have not found a solution to my problem. 97ss camaro with le2 heads and cam new forged 355 with stock crankshaft. Ecm reprogrammed by pcm for less, 36lb injectors, new msd coil etc etc.
Ok the problem is #7 won't fire correctly. Header won't heat up to the point where if i spray water on that tube it doesn't evaporate instantly like it does on the other 7 header tubes. Thats how i found what cylinder was misfiring. So i got a spark tester and it doesn't shoot spark continually it goes on and off... Ok it goes like this ".. .... .. .. . .... . And then no spark then it comes back. Why is the optispark not sending spark constantly to that one wire? Could it be the cap and rotor? Or the optispark itself? The car ran fine for a couple of days and a few day later it started miss firing bad. Now i started off by checking the injectors accel 36lb brand new checked the signal too with doids has signal.. Scratched that off the board when i double checked the spark on that wire with spark checker and the second time it failed so i thought its the summit racing wire thats bad. I ordered msd super-conductor wires, same thing. Spark comes and goes at time doest see no spark. Why only #7????? Why oh why. Went and bought new map sensor, started easier but still the miss is there. Is there anything else i can check before i pull the damb opti off? I bought this car broken i put alot of time into putting it together and get it running i just would like someones opinion or maybe they had the same issue and found the solution. Oh, i just got my 02 sensors gona install them but i doubt that will fix it.. Ome more thing, when i first got it running one of the coolant hose on the water pump was leaking and spraying coolant all over the place. Any help will be appreciated 97ss |
Re: 97 lt1 missfire on #7 i need help!
Originally Posted by 97sswcubes
(Post 6998483)
Oh, i just got my 02 sensors gona install them but i doubt that will fix it..
Ome more thing, when i first got it running one of the coolant hose on the water pump was leaking and spraying coolant all over the place. Any help will be appreciated 97ss The note about spraying water....could have gotten "in" opti. Usually that would cause misfire over various cyl what brand of opti do you have |
Re: 97 lt1 missfire on #7 i need help!
Originally Posted by Chimera96
(Post 6998484)
misfire on one cyl only....either plug, wire or opti assuming the injector for that cyl is good.
The note about spraying water....could have gotten "in" opti. Usually that would cause misfire over various cyl what brand of opti do you have |
Re: 97 lt1 missfire on #7 i need help!
It seems unlikely to be the OPTI at this point but it certainly could be. Look first at the wire itself...maybe even replace it with an old one if you have one around. If that turns out to not be the problem and the spark plug is known to be good, then look at the OPTI...
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Re: 97 lt1 missfire on #7 i need help!
Originally Posted by bw_hunter
(Post 6998486)
It seems unlikely to be the OPTI at this point but it certainly could be. Look first at the wire itself...maybe even replace it with an old one if you have one around. If that turns out to not be the problem and the spark plug is known to be good, then look at the OPTI...
1st set of wires are summit racing new. Thought it was the cheap wires so i ordered the msd. Still the same problem. |
Re: 97 lt1 missfire on #7 i need help!
Given you have put 2 sets of wires on, check FI working and spark tester shows no or intermittent spark on #7.....pointing hard at Opti. The cap itself may have a defect on the #7. The caps used on the no name clones are cheap. MSD C&R is very good, not the MSD Opti though
If the Summit Opti is under warranty you can get another one and roll the dice on it. To bad the AC Delco one you had was damaged in flood. Occasionally rockauto has AC Delco remans |
Re: 97 lt1 missfire on #7 i need help!
Originally Posted by Chimera96
(Post 6998488)
Given you have put 2 sets of wires on, check FI working and spark tester shows no or intermittent spark on #7.....pointing hard at Opti. The cap itself may have a defect on the #7. The caps used on the no name clones are cheap. MSD C&R is very good, not the MSD Opti though
If the Summit Opti is under warranty you can get another one and roll the dice on it. To bad the AC Delco one you had was damaged in flood. Occasionally rockauto has AC Delco remans |
Re: 97 lt1 missfire on #7 i need help!
You only have to remove the damper/pulley portion, the hub does not have to be removed. Typical problem is rust on the hub, sometimes requires a 3-jaw or a crow foot (96/97) to get the damper/pulley loose.
http://shbox.com/1/pull_pulley.jpg |
Re: 97 lt1 missfire on #7 i need help!
Originally Posted by Injuneer
(Post 6998490)
You only have to remove the damper/pulley portion, the hub does not have to be removed. Typical problem is rust on the hub, sometimes requires a 3-jaw or a crow foot (96/97) to get the damper/pulley loose.
http://shbox.com/1/pull_pulley.jpg Hopefully that will be the end of that. Thanks for the advice |
Re: 97 lt1 missfire on #7 i need help!
Any chance it could be the ignition control module ?
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Re: 97 lt1 missfire on #7 i need help!
possible ICM, more likely Opti given it is specific to # 7
Typically a ICM fail is no start or shuts off after the engine gets to temp and won't restart If you are pulling opti, remove cap and hold up to a bright light and look for any "tracking" (arc) between the paths imbedded in cap |
Re: 97 lt1 missfire on #7 i need help!
Check the #7 wire terminal on the cap for corrosion.
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Re: 97 lt1 missfire on #7 i need help!
Originally Posted by Chimera96
(Post 6998496)
possible ICM, more likely Opti given it is specific to # 7
Typically a ICM fail is no start or shuts off after the engine gets to temp and won't restart If you are pulling opti, remove cap and hold up to a bright light and look for any "tracking" (arc) between the paths imbedded in cap Forgot to mention one thing. The car flooded completely during Harvey that includes ecm. Didn't want to throw this into the mix since the car ran ok for a few days after i first started it. So im guessing the ecm survived even though it was under water. 97sswcubes |
Re: 97 lt1 missfire on #7 i need help!
Originally Posted by 97sswcubes
(Post 6998498)
Didn't want to throw this into the mix since the car ran ok for a few days after i first started it. So im guessing the ecm survived even though it was under water.
97sswcubes was the pcm4less tune done after the flood? so the opti was completely submerged also?? |
Re: 97 lt1 missfire on #7 i need help!
Originally Posted by Chimera96
(Post 6998499)
wtf...car was under water including the pcm…
was the pcm4less tune done after the flood? so the opti was completely submerged also?? |
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