Ok first I want to start off by saying that I have been reading the forums for a while and even found my car here. I have a 95 Z-28 with few mods.

Same old opti story. It was about to **** the bed, so rather then replace a ****ty part with another ****ty part I decided to upgrade. The Delteq install was easy and the car fired right up.

Problems before Delteq:
missing a lot
plugs covered in carbon
stalled when wet

Problems after Delteq:
White powdery plugs (looks lean)
misses @ 5200+

So I took the usual steps in T/S a fuel problem. I replaced the O2 sensors and fuel filter and reset the computer. The car ran a bit better because of the O2's but I still had the same problem except it didnt miss when the engine was cold.

After reading about many other people with the same problem I called Delteq and talked to JC. He claimed there has never been a single other problem with the system. That is until I told him about one other guy I was reading online about that had the exact same issues. Then he admitted to "one" other issue with a alternator that wasnt putting out enough volage. He says at high rpm's the alt needs to put out alteast 12.4V. I told him I would call back later after more online research.

Here is what I found:
http://lt1tech.com/cgi-bin/ultimateb...;f=19;t=000043
http://www.mainstreamtopics.com/foru...ded&show=&st=&


That was just after a few min of reading. Does anyone have the Delteq system "Opti eleminator" (since it totaly eleminates the opti ) and did you/are you have any problems? Any and all feed back would be greatly appreciated.

Thanks

 

There was an Electromotive "SDI/Opti-Eliminator" that was designed by JC when he worked there back in the mid-90's. It had "issues". Worked great on a 93, where injector sequencing is not a problem. On a 94 or newer, with only a crank sensor feeding the chip that synthesized the high- and low-res pulses to satsfy the PCM, 1/2 of the time the injectors were firing 360deg out of phase (on the wrong crank revolution). That led to an extended start period (probably also caused by the time it took the chip to synthesize the Opti signals), and a stumble off idle when the engine was cold.

But the bigger problem was a complete sudden shutdown for an instant, exactly like the PCM had hit the rev limiter. Although I had been working closely with JC because I bought one of the first units, and had even gone to E'motive in Manassas to show him the setup, and provide him with wire lengths, etc., when the problem hit he suddenly became "scarce" and left me to sink or swim on my own. I eventually ditched the Opti-Eliminator and went to another system.

Left a very bad taste in my mouth for the man and his products.

 

WOW. Thats about all I have to say. WOW.

Not quite the problem I am experiencing, but thats no good. I wish I had done a bit more reasearch before purchasing the product...

Also, I would like to add that I am not throwing any codes at all.

 

I am personally thinking about ditching the delteq system. I am just frustrated, because I can't retard my timming from inside the car--not that it's delteq's fault it's just there really isn't anywhere to go except a basic ignition system--no rev limiters, no retards, etc. If Crane Cams still made the TRC-1 it would be okay, but they like to discontinue good products, and won't disclouse anything about them, even though they stoped making it cause no one wanted it I guess MSD is just running them into the ground.

This has nothing to do with your set-up though. Yours is some other problem. You had problems before the delteq. The delteq system works great. You just need to find out what the other problem(s) are could be a number of different things. Not much help huh....sorry buddy

 

There was at least one thread about 6-8 months ago on fbody.com LT1 forum, where a guy had problems similar to yours, and JC finally admitted there was no way the Delteq would ever work with his car, and he sent the Delteq back for a full refund. No way they can say they've never had a problem with the system.

 

Im not the only one who has had the exact same problem and I didnt have THAT problem before the install. Im thinking maybe its the optical sensor on the opti. Im going to take it into the shop and make sure the coils are firing ok, check the plugs, check the wires, check fuel pressure, and look for vac leaks. Maybe Ill find a couple more symptoms.

 

A few more questions...

1. What is the fuel pressure suppose to be at?
2. What resistance should I read on the plugs and wires?
3. What should I set my gap to on my plugs?
4. What plugs would you recommend that I could buy at Advanced Auto?
5. What should I look for on the coils to see if they are good or bad?


any input would be greatly appreciated.

 

when you say THAT problem what are you referring to in my post?

No problems before the install huh^ What does "Problems before Delteq" mean then?You had problems before the delteq, how can you claim the delteq is not working properly?? If you had a perfect running car before you installed it then could make that claim.

I guess I don't know what problem exactly you are referring to then. You went from missing a lot to only missing @5200 rpm.

I am not saying it isn't possible for the delteq not to work on your car, just not very likely. If your worried, send it back for a refund and get another opti spark, but if you have another problem with is very likely you will still have the miss with a crappy optispark. It's more likely you have other problems. If you check everything out and still have the miss then send the delteq back, but since you went from missing all the time to only missing way up high is is more than likely somehting else now causing the miss. Could be a failing optical sensor no one knows. Don't just install a part and think it's going to cure all your problems and then when it doens't say it's the parts fault, that's not good troubleshooting skills.

Now your looking in the right direction.

 

Before I was intermittently missing mostly at lower RPM's (800-2800)
Now I only miss at 5200+ and its only when the motor is warmed up.


When I say THAT problem I'm referring to the one I currently have.

I have found at least half a dozen other posts on various boards (ls1tech, lt1tech, fbody, camaroz28, etc..) of people with the same problem or something close to it. Most of them have contacted Delteq with either excellent or crappy assistance. I find that strange considering JC claims there has only been "one" problem in the products history.

I apologies for being vague in my last post.

 

apology accepted.

O I know they have had more than one problems with there products. But the majority work great. My bracket came with the hole about a 1/4" off for the valve cover bolts. I had to modify it to accept the bolts.

It's just I see posts all day long where people look over the basics like a burnt or defective spark plug wire and blame it on another part, which indeed is working just fine.

I always start with plug wires when I have a miss.

I would just send the delteq back to them then if you believe it to be defective. Is that what you are tying to do and they won't take it back?

 

This is the direction that I was initially looking. Im keeping the realm of possabilities open as any good technition would. Thats why I was asking what other symptoms I should be looking for. If we could take this from my online hanging to a little technical assistance that would be awesome.


Other possablities that I have considered:
Fuel Injectors (not probable because all plugs look identical)
Fuel pump (no strange sounds and I had 39psi at idle which I think is good)
Optical sensor ( I found that I can replace just the base assembly and sensor for 150$ or so)
crappy plugs (Champion douple plats gapped .060 which is a bit big. Im considering NGK's or AC DELCO)
plug wires (is a common and known problem with the Delteq's complete kit)


that is all I have come up with so far. Id like to get this fixed so I can go ahead and buy my pace setters and install them...

 

I'll take my assistance elsewhere...

 

Have been searching the forums for the past 4.5hrs. I have learned a lot, Im just more of an old school chevy guy more so than this new computer driven stuff. I know that gap is huge. What do you think of a .045 or .040? It miss fired at .040 the same as it does now.

How would I go about checking these plug wires? Is there a paticular resistance I should look for? I am assuming the lower the better. I didnt see any cracks or splits when I installed them. I did have to mash the ends with plyers a bit to make them snap on tight though.

Thanks

 

Is .060 what Champion recommends their plugs to be gapped at?

 

I just read that it is .050 Guess I ought to regap them, huh? * slaps forehead*

All the same I had the same problem with a smaller gap before...