New Wires/Opti...wont rev past 3k.

[nascarnate326]

Today I installed a new opti and new wires onto my 1996 Z28. Got it all back together and it starts up fine, idles great but when I rev it, it cant rev past 3k-3500 rpm. Its like it wants to but doesnt have the spark or something.


If the wires were mixed up would it idle perfect or would it be obvious that something is wrong?

Opti fit on perfectly snug and lined up with no issues. Wires appear to be all snapped on correctly with no issues there.

We drove it down the driveway and it felt like it was cam surging at 1300 rpm.

Bad coil?

Any ideas?

[Lucky SOB]

What brand opti?

[s.reef]

How are the plugs?

[nascarnate326]

Chanler and plugs should be good.

[masterfab]

Chanler and plugs should be good.

depending on what wire's are mixed up. it possible for it to idle smooth until you put a load on the engine. give yourself a piece of mind and double and triple check them.

[nascarnate326]

depending on what wire's are mixed up. it possible for it to idle smooth until you put a load on the engine. give yourself a piece of mind and double and triple check them.

Going to do that and check the SES light thats on. Got to go get a scan tool when AA open up.

I know the SES light has been on for an 02 sensor that is supposed to be "tuned out" at this point I feel like I would be throwing money at the car with out my own code reader.


any other ideas?

[nascarnate326]

No back firing, opti went on pretty easy. It "clicked" in and the mounting points were perfectly flush.

Went and bought a scanner and it says p0300 random multiple misfire detected.

I have a small video of the live stats that I took.

Also right after I started the car I revved the he'll out of it and it revved to my 6k redline. Not good for a cold motor but it did it. Wait about one or two minutes and it does the 3k max.


Scanner shows I have a 02 sensor problem too, have had that for a while. Would changing the opti and wires make this worse?



Ideas?

[masterfab]

No back firing, opti went on pretty easy. It "clicked" in and the mounting points were perfectly flush.

Went and bought a scanner and it says p0300 random multiple misfire detected.

I have a small video of the live stats that I took.

Also right after I started the car I revved the he'll out of it and it revved to my 6k redline. Not good for a cold motor but it did it. Wait about one or two minutes and it does the 3k max.


Scanner shows I have a 02 sensor problem too, have had that for a while. Would changing the opti and wires make this worse?



Ideas?

i would almost garentee fireing order is wrong. that would explain the multiple misfire's.

[JoeliusZ28]

Also right after I started the car I revved the he'll out of it and it revved to my 6k redline. Not good for a cold motor but it did it. Wait about one or two minutes and it does the 3k max.

This could be possible with the firing order wrong because a cold engine runs richer and therefore could be more fuel remaining in the cylinder after an unburnt exhaust stroke.

[nascarnate326]

Went over wires again and they match shbox perfectly.

What about fuel filter? My car has almost no gas in it right now and was lifted way in the air.

What about coil?

Drives around at 1500 rpm pretty nice, feels like cam surge though.

Here is a vid, good speakers will hear more.
http://youtu.be/He1id1YN9Ic

[nascarnate326]

Is it possible to put a vented opti on wrong? 99.99% sure it's on correct.

[Boost Addict]

If it didn't have the issue before the change, it's not the fuel filter. I don't think you can put an opti in wrong. I mean it just has to be lined up with the dowel and it should be good.

[Boost Addict]

Are you sure you didn't install a 2 step rev limiter along with the opti and other stuff?

[masterfab]

nate just giving you this info just incase shoebox had a typo.

fireing order
1-8-4-3-6-5-7-2

other than that i have no idea unless the plug wires are cross firing. but that hasnt been a problem for me on lt-1's. put some gas in the car and rive it for a few minutes and see what happens. this is weird it sound just like a incorrect firing order.

[nascarnate326]

nate just giving you this info just incase shoebox had a typo.

fireing order
1-8-4-3-6-5-7-2

other than that i have no idea unless the plug wires are cross firing. but that hasnt been a problem for me on lt-1's. put some gas in the car and rive it for a few minutes and see what happens. this is weird it sound just like a incorrect firing order.

Actually the reason I changed the opti to begin with was that it had a hesitation...it would go. It was like the opti had to "spool" and perhaps the car being so low on gas clogged up the filter?


I am clueless. Throwing no codes, nothing is burnt, broken, or smells.

If the fuel filter doesnt do it Ill send the opti back and get another one.