LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Update on Delteq/Misfire problem

Old Sep 10, 2007 | 03:26 PM
  #31  
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My delteq had a bad seating with one of the coil packs. It was due to the screws that hold the coil pack down. If you can wiggle the coil packs, then they are not seated properly. They should be secure.
Old Sep 10, 2007 | 09:41 PM
  #32  
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If your not getting fire on 2 cylinders on 2 different coil packs take a look at the other plugs or wires that share those 2 coils. The 4 coil setup cant fire just one post of any coil. Both cylinders on the same coil fire at the same time. its a waste spark system. The rare times I have found weak or no spark on one side of a coil its been a bad plug,very close gap or dead short to ground on the fireing side of the coil stealing the spark from the misfiring side. The voltage it going to take the easiest path to ground. This should be a VERY easy to troubleshoot.
Old Sep 10, 2007 | 09:55 PM
  #33  
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I believe it most likely should be easy to figure out but my mechanic sucks. He thinks he can tell what it is just by talking to me and then it costs me money to replace good parts. He ordered a whole new Delteq today and if it doesnt do the trick im going back to the optispark. I just hope he didnt already throw out my old coil.

BTW, I went to check if any of the coil packs were loose and one of them wasnt screwed down at all on one side. The screw was just sitting in there and I was able to just pick it up out of the hole. I got excited for a second and then realised that particular coil wasnt one of the ones that is missing.

I'm really starting to to lean toward the icm or the opti cam sensor.
Going to wait for the tech 2 scan first though before spending anymore money.
Old Sep 11, 2007 | 03:44 PM
  #34  
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Sooooo did ya read my post above? Its NOT the opti OR delteq system. NEITHER has the ability to fire only one side of a coil pack so that rules those out. are you SURE the 2 missing cylinders are not on the same coil?
Old Sep 11, 2007 | 05:17 PM
  #35  
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Since you have the Delteq and it will likely be ruled out as a cause of trouble - keep it!
Find the true root cause of your problem and repair it. Stop switching things around without evidence you are removing a fualty component - your chasing mice.

I have an unknown mis/skip/bog with my car rigt now too...I'm struggling with time and money with my mechanic. But I'll wait for conclusive proof we are looking at the problem (fuel,spark,vacuum, etc) before I throw parts away or buy new ones.
Old Sep 11, 2007 | 06:27 PM
  #36  
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Originally Posted by MR.ED
Sooooo did ya read my post above? Its NOT the opti OR delteq system. NEITHER has the ability to fire only one side of a coil pack so that rules those out. are you SURE the 2 missing cylinders are not on the same coil?
dude you have no idea what your talking about so stop

i have seen many many ocasions where only one post of a coil have gone bad. not that i am saying this is what his problem nor do i even think thats what it is but your misinformation is not helping the situation, and did you even read the part of the thread where he said he put this sytem on due to a miss
Old Sep 11, 2007 | 07:48 PM
  #37  
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For the longest time my mecahnic has been real short with me and not very willing to put alot of effort into trying to locate the root of the problem. Last time i went in there he was out doing something and his wife was sitting at the counter. I sat down and talked with her for about an hour and explained what I have been going through with him and the next day he called me and was being all nice. Now he has stopped trying to get more money out of me and his trial and error from that point on has been on his dime. If he cant figure out the problem and we have to take the car to the dealer, he is going to pay for that also. For the diagnostic i mean. So, now it just an inconvenience but at least its not costing me any more money.
Old Sep 11, 2007 | 09:27 PM
  #38  
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dangalla... I guess you didnt read the very first post...Where he said the coils were swapped and ruled out. If the coils are NOT bad then explain how the opti or delteq box is firing only ONE post of the coil. It wont happen... if the coil is in fact good then BOTH posts must spark. What happens after that is where the issue is going to be. The post you quoted is FACT"NEITHER has the ability to fire only one side of a coil pack so that rules those out." Do you dispute this? Then you go on to say That a coil can have a bad post(very true) but those statements have nothing to do with each other. Its also possible the mech is feeding ALL bs and none of us are right. Please read all the available info before tring to flame someone. After all it does not help the problem at hand.

Last edited by MR.ED; Sep 11, 2007 at 09:37 PM.
Old Sep 11, 2007 | 09:36 PM
  #39  
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az0884 I didnt see if the plugs were changed yet. Im assuming they were changed when the wires were done. If not they can easily be an issue. I DID see that the mech checked them. Plugs can cause all kinds of issues. Even if you get the cheapest ones and change them yourself its worth the peace especially as cheap and easy as it is. remember to look at the plugs on the other (firing) side of the coils.
Old Sep 11, 2007 | 10:01 PM
  #40  
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Yes the plugs were replaced when the wres and delteq were done. Of the 2 that are missing, he pulled one of them back out and checked it but not the other one because the exhaust had to come off on the passenger side to get to it because of the shorty headers and y-pipe. Ive been looking at it though and I think I can do it without removing the exhaust. In fact, it actually looks to be a little easier than with the stock manifold.
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