i had to drive home at 4500 rpm cause the little sensors on it were dirty on time cleaned them and shazamm 
LT1 might be LTjunk
Originally Posted by 7901 WS6
Fuel Filter wouldnt hurt to do again, I will do a leak down test first before anything.
Opti was replaced with a MSD, 515.00 was a better price to pay than 674.00 that GM wanted for their P.O.S.
Opti was replaced with a MSD, 515.00 was a better price to pay than 674.00 that GM wanted for their P.O.S.
ouch! summit sells the for 3 something i believe. also try the gm parts sponsors on this board, they do wonders on getting u a part cheaper than your local gm dealer.
do the fuel filter just to ssay you tried it cause its cheap.. if not that id be looking to the pcm or the fuel pump like they said... if its not the pump... pcm can cause all your problems but is by far the most expensive... its deff not the collant temp sensor... i broke the connector on mine installing my headers and duct taped it on and it would flicker going down the highway i drove like this for 3 months with no problems... good luck man...
On The Tree
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Originally Posted by transmaro93
do the fuel filter just to ssay you tried it cause its cheap.. if not that id be looking to the pcm or the fuel pump like they said... if its not the pump... pcm can cause all your problems but is by far the most expensive... its deff not the collant temp sensor... i broke the connector on mine installing my headers and duct taped it on and it would flicker going down the highway i drove like this for 3 months with no problems... good luck man...
that is the sensor for the gauge located in the head there is a seperate sensor for the pcm located in the waterpump housing and it could very well cause the problems he is describing.
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From: Decatur, TN (N-W of Athens)
If they have a core charge on them, they're not new. Summit might not have a core charge, but they probably charge a bit more for the units outright. I'd be surprised if they sold new-new ones, instead of Remy-new.
I don't see how it could be the ECM. Hardware is a work, or no work sort of thing. The software in them can't have problems like out computers, because they're built into a EPROM, not a hard drive. If it was in Limp Mode, he wouldn't be able to go like he is.
It could be the fuel pressure, but again, that can easily be attributed to the fuel filter not letting enough fuel pressure though.
As for the location, Billy is right. For the problem, this is my semi uneducated opinion: I don't think it would be causing that sort of problem. Seems more like it would still work normal, but would have less power throughout the RPMs, but he could still floor it and it not cut out.
I don't see how it could be the ECM. Hardware is a work, or no work sort of thing. The software in them can't have problems like out computers, because they're built into a EPROM, not a hard drive. If it was in Limp Mode, he wouldn't be able to go like he is.
It could be the fuel pressure, but again, that can easily be attributed to the fuel filter not letting enough fuel pressure though.
As for the location, Billy is right. For the problem, this is my semi uneducated opinion: I don't think it would be causing that sort of problem. Seems more like it would still work normal, but would have less power throughout the RPMs, but he could still floor it and it not cut out.
Just from my own experience mine has done the same thing you are explaining. I replaced the pcm because it was showing it was bad. It ended up not being the problem so i went ahead and replaced the opti with a gm performance opti and it ended up being the worst mistake ever. I went through 3 in about 4 months. I went ahead and got the MSD upgraded opti for the car and it cost me $800 for it but i have yet to have that problem again. It might be one of your more expensive parts to buy but if you bought it from them not to long ago you might have some sort of policy for a defective part. It might be a long shot but if nothing else works you might look into it, as much of a pain as they are to change.
I just had this same problem. Clean the MAF and the electrical wire that plugs into it. Also change your fuel pressure regulator. What was happening to my car, as far as I can understand, is that the FPR was sending too much gas into the 2,4,6,8 cylinders causing the car to feel like it was misfiring. I changed those and so far so good. I would also change the 02 sensors and cats that couldn't hurt.
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From: Decatur, TN (N-W of Athens)
The FPR doesn't discriminate cylinders. The main line goes into it, and then it splits to each bank.
Litch, the MSD Opti is only $519. Or was this years and years ago when it was new?
This is a bit far off, but could the Air Temp Sensor be bad, unplugged? I don't know how the cars react with it bad or unplugged, so it's a total guess.
Litch, the MSD Opti is only $519. Or was this years and years ago when it was new?
This is a bit far off, but could the Air Temp Sensor be bad, unplugged? I don't know how the cars react with it bad or unplugged, so it's a total guess.
Update, Sorry I havent said much got busy with some home projects, I got a Fuel Pressure gauge now and will test to see what pressure I am getting at KEY on, Then I will start it up let it RUN, Record pressure Shut off and see if Pressure Drops. Will this be good to determine if I have a leaky injector. I will also CLEAN the MAF with MAF cleaner too
Test Okay got my results on the FUEL PSI, 
Setting:
Last time car was ran was on 6/2 (just around the block)
Car has been sitting ever since on flat level driveway. 4 days
1: open gas tank cap to relieve pressure(Heard some hissing of air being relieved)
2: push in Schrader valve with Screw driver and Gas shot out!(Great no leaky injector???)
3: connect gauge
4: key on! PSI raised up to 10psi
5: let it sit for about 5 min
Still 10psi
6: start up psi raised to 19psi
Mybook says it should be between 41-47 at key on and drop about 10psi when running.
7. Shut off Psi still at 19 and dropped while off to 10psi again.
8. Leaving gauge on over night just incase if drops any more.
also I really cant hear my pump when key it turned on..
IS IT MY Pump?? I still need to change fuel filter Should I do that first then retest??
I want to Drive again 
Setting:
Last time car was ran was on 6/2 (just around the block)
Car has been sitting ever since on flat level driveway. 4 days
1: open gas tank cap to relieve pressure(Heard some hissing of air being relieved)
2: push in Schrader valve with Screw driver and Gas shot out!(Great no leaky injector???)
3: connect gauge
4: key on! PSI raised up to 10psi
5: let it sit for about 5 min
Still 10psi
6: start up psi raised to 19psi
Mybook says it should be between 41-47 at key on and drop about 10psi when running.7. Shut off Psi still at 19 and dropped while off to 10psi again.
8. Leaving gauge on over night just incase if drops any more.
also I really cant hear my pump when key it turned on..
IS IT MY Pump?? I still need to change fuel filter Should I do that first then retest??
I want to Drive again all you have to do is pull your fuel filter off and blow in it, if stuff comes out the other end it is fine, otherwise you can go in to a shop and they can test your injectors and see which ones are B/O. Or you can replace the pump and see if that fixes it, you have a few things to see what your problem is but something fuel related is def the issue.
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From: Decatur, TN (N-W of Athens)
Originally Posted by transambandit
all you have to do is pull your fuel filter off and blow in it, if stuff comes out the other end it is fine
So, again, I tell you, as I did in the FIRST REPLY, replace the fuel filter lol. I even said before you tested the PSI, a clogged filter will cause your PSI to not read right.
My mom's 2002 Monte Carlo had this exact same problem. You could creep up to any speed you wanted, but as soon as you gave it 3/4 pedal to WOT, it would hesitate, backfire, and generally run like crap.
First we replaced the fuel filter. Didn't fix anything. Then we checked the fuel pressure. It was fine.
Finally we took it to a mechanic and it turned out to be a clogged CAT. Took it to the dealer and they replaced it for free. At the time (last summer) her car only had about 60K miles on it too.
First we replaced the fuel filter. Didn't fix anything. Then we checked the fuel pressure. It was fine.
Finally we took it to a mechanic and it turned out to be a clogged CAT. Took it to the dealer and they replaced it for free. At the time (last summer) her car only had about 60K miles on it too.