cruzinMaroZ28

what is the chances that i got to ac delco opti and the both dont fix my problem but one i bought from some guy and one i bought i got from summit so what are the chances u guys think? i really need to get this car running

ricehammer

Chances are the problem is somewhere else. Especially if you used the new GM unit from Summit. Clue us in again, what's up??

Rick Speed

Chances can be very good.. what kind of problems are you having?

mrmint69

The opti's are very hard to figure out. I see some that have had them go out several times and some go 250K+. The worst part is if you have a problem, it has several things that it can be and the opti usually is one of them and then a dozen other things that it can be. I have read a lot of posts where it was a simple burnt plug wire, crossed wires, opti connector and on and on that could have been fixed for free or very cheap. The odds two different opti's are both bad is a very long shot but im sure it has happened before.

cruzinMaroZ28

well it all started my car started runnin like ****...wont rev up while driving,stuttering, sounds like i have a cam, blowin black smoke..so i swapped opti's and the coil and it started but sounded like a cam agian and then shut off..and now it starts somtimes and not other times and still sounds like a cam...i took out all the plug wires checked them and re-installed them, i took my opti off like 6 times makin sure it is on right so i have no idea what is goin on any suggestions? i really NEED HELP
and my car is a 94 so its splined

mrmint69

Sounds like a major running issue. Do you have any codes? There are so many things you can try. I would check the fuel pressure and go from there. Eliminate the cheap and easy things and hope that you find your problem.

cruzinMaroZ28

im not really sure how to check fuel pressuer are ther gauges i can buy for that, im not sure if im throwing any codes i dont have a check engine light and i dont have a reader...anything else could it be besides fuel...if my coil isnt grounded properly would that cause problems ?

mrmint69

I bought a fuel pressure gauge at the auto parts store for $25. Very nice quality and all you do is plug it into the schrader valve. Then run the hose up through the hood and tape it to the windshield or use the wiper to hold it in place. Then take a drive and watch it as you go through various throttle runs. The same store might have a code reader also and can get you the codes if there are any. They are stored and will show up even if you have no check engine light. As long as you haven't unplugged the battery very recently. I don't think the coil needs a ground.

cruzinMaroZ28

but my problem is i cant get it to start so driving is out of teh question....but i do need to buy a code reader and thanks for the advice

mrmint69

You don't need to drive the car to check the fuel pressure. You can just turn the key but not start it and see what happens. I had a problem with the fuel pressure going sky high and i got lots of smoke and it sounded and ran like it was on 4 cylinders. You might need to turn it on and off several times to see if the pressure continues to rise. This is one of the most useful tools so even if you think its something else you should have one anyways.

ricehammer

Get a fuel pressure gauge, the Schrader valve is located here http://shbox.com/1/fp_reg.jpg. Pressure should be around 40 psi. On the primary side of the coil (the side with the connector) there is no ground. Input is 12V and out goes to the ICM. The secondary (coil wire side) is grounded to the coil core and through the screws/rivets that hold it on. Check the grounds that are connected to the bolt that holds the ICM/coil to the head. Also check the ground that goes to the body from the ICM/coil bolt.

Just a couple ideas, hopefully one works