I had a misfire so I had a Delteq system installed and also did the plugs and wires. After the install the the misfiring was MUCH worse and there was arching coming off the passenger side header. So we replaced the wires with new Taylor wires again. No change. So replaced the wires with the MSD 8.5 wires and the arching goes away but still misfiring badly. So, the mecanic does the mass airflow sensor and no change. Then the fuel injectors and no change. Then o2 and no change. There is a dead misfire on cyclinders 1 and 5 which are fired by seperate coil packs, but swapping coils with the working ones still made no change. Delteq sends out 5 opti-boxes and try them all with no change. Delteq refuses to send out a new ICM.

Also as a sidenote: Apparently Delteq has 6 different systems depending on the VIN of you car and they have no idea which goes with which. Hence sending out 5 opti-boxes. (Yes they charged for all 5)I DO NOT recommend this product at all. The people there have no idea what they are talking about.

On Monday I am going to go back to the optispark setup an If its still running badly I am just going to take it to the dealer for the Tech II diagnostic.

Anyone have anything I could try in the meantime? My mecahnic cant figure it out and hes just making up solutions that end up costing me money with no results. His next idea is the PCM and Ide rather sell the car if it gets to that point.

Thanks for any input.

 

if you are having arcing on the headers then i dont understand how you are blaiming the delteq on that. its job is to produce spark right? its the sparkplug wires and the plugs to send the spark to the combustion chamber. are you sure you didnt crack any plugs when installing them?

 

Im not blaming delteq for the arching. I think you missed the part where changing to the MSD wires solved the arching.

 

yes but didnt you say you had a missfire problem before you installed the delteq? if so maybe you should have isolated the problem before just throwing parts at it. what year is your car and is the check engine light on currently? i work for gm and the only thing we can do with a tech2 is check and see what cylinder is missfiring and what codes are in it.

 

All Taylor wires put on firework shows under the hood from what I hear.

Have you adjusted your valves lately?

Check your fuel pressure.

Do a compression check. A bent valve will have symptoms similar to a bad misfire.

I don't think it's fair to say bad things about Delteq. Your problem is not with their product. It isn't their fault you are blindly swapping MAF's and injectors and it isn't solving your problem, but costing you more money.

Do the things I said above and if those check out OK we'll go from there.

 

No SES light. I know which cyclinders are misfiring but nobody can figure out why. Ide love to isolate the problem but thats easier said than done and with a misfire noting is guaranteed to be the problem until you replace it and find out. I cant think of anything at all though that can cause this that hasnt already been replaced. Believe me, I am sick and tired of throwing parts at it but I have no clue what the problem is so I am having replaced what mecahnics tell me to have replaced. It really approaching the point where I might be better off getting a different car because I have already put alot more money into it than it even worth and it still runs like crap.

 

A local performace shop checked the fue pressure and valves. I forgot to mention that. This has been going on for a long time and has been to many places.

 

Did you do a compression check?

 

BTW I think it is definately fair to trash talk a product that has 6 different versions for different VIN numbers but has no idea which part# goes to which VIN#. It was Delteqs idea to do the maf and the injectors btw.

 

1racerdude, No a compression test hasnt been done. The mechanic said he doesnt think thats the problem because before it had a slight misfire but as soon as we put i the delteq it ran all messed up, backfiring and such. He said putting in the delteq system wouldnt effect the compression. What do you think?

 

give us a rundown on what was on the car before you went to the delteq setup.

....give us some more info, does it miss at idle or when you go down the street? same RPM or all over the place?does the car pop and backfire? help us help you

 

the delteq wouldnt effect the compression. and there is NO way a mass air flow would cause a miss on only two cylinders. injectors maybe. valves maybe. is this a stock motor?
again are you sure there is not a problem with the plugs?

 

Not true. My bent valve threw no SES code either.

You can test your ignition system and find out EXACTLY what the problem is. There is never a need to go replacing parts that aren't bad.

Test the ICM, test the coolant temp sensor on the water pump, check the fuel pressure, check your valve adjustment, and check your cylinder compression.

A cylinder with 0 compression will feel like a misfire, throw no code, and have you runnin' wild replacing parts.

Can you get video?

 

I would do the check on all 8 as you had a "miss" before doing the Deltaq. Ya may have a bad valve, gasket,ect.
Your mechanic must have a good crystal ball.....

 

LOL i was thinking the same thing.

I would take it somewhere else, thank him for time and money wasted and leave without paying.

He obviously doesn't know the LT1.

And it isn't delteq's fault you replaced the MAF and injectors just because they suggested it.

Have you checked your vacuum? Have you checked anything?

An intake manifold leak will cause a misfire as well.