New Opti- Runs terrible
#1
New Opti- Runs terrible
I have a 1995 Trans Am LT1, supercharged, new motor, etc. So about a month ago I finally got this thing running good and then all the sudden it started dying at high RPM's (completely dying- try to get on the highway, would die as soon as it got over 3500 RPM). It wouldnt start the next time I tried to start it, but then I did get it to start once or twice. (It would always crank, just never fire) I figured it was ANOTHER opti, I had the jegs one for about 1000 miles, so I put in a GM one from Summit. However, the thing still wont run. It started for about 10 seconds, sounded like crap, (dad/mechanic thought it sounded like the timing was advanced) and then it died and has not again restarted. Is my new opti bad? I have had that happen before. I also read some other posts where a fuel pump could cause this. Thanks for all the help.
#4
12 Second Club
iTrader: (30)
Join Date: Nov 2006
Location: Cloverdale, BC
Posts: 1,348
Likes: 0
Received 0 Likes
on
0 Posts
Whats greg said, I'd be looking into if the opti was installed correctly (the cam dowel is in the right spot on the opti). From what you mentioned it sounds like the new opti was installed in the wrong position. And if you want to make sure the fuel pump is good throw on a fuel pressure gauge and see what kind off pressure you get.
#5
i vote coil or module SINCE originally it was breaking up and dieing at high rpm where a coil shows its weakness the most if its still trying to spark.
but i would for sure check the fuel pressure as well as it could make it die at high rpm as well
but i would for sure check the fuel pressure as well as it could make it die at high rpm as well
#7
Mine would die over 3k also and I just replaced Opti. Eventually it went out completely and wouldnt restart. Coil and ICM later she runs great. I missed the cam dowl on my 1st Opti install and it ran fine for a min then it managed to move and sounded exactly like it had jumped time. Once it moved though it wouldnt run for ****.
Trending Topics
#9
On The Tree
Join Date: Sep 2010
Location: Dunedin, Florida
Posts: 198
Likes: 0
Received 0 Likes
on
0 Posts
shbox.com has a good view of the opti and where it should be at tdc for each piston... I would first pull the coil and check that. I believe Autozone can test it if not here is a link to with the specs to test it yourself. The other thing to give a quick check to is fuses for the injectors. I had one blow for what ever reason and it felt like the cam was 180 out. Car would start sometimes but would not stay started of coarse it was only running on 4 cyl.
http://shbox.com/1/coil_testing.jpg
http://shbox.com/1/4th_gen_tech2.html#opti_test
http://shbox.com/1/coil_testing.jpg
http://shbox.com/1/4th_gen_tech2.html#opti_test
#14
Mine did the exact same thing last week. I was driving and when it got around 3000 the car would shut off. Then after starting it a few times it stopped firing. I had a new opti, Coil, ICM, wires, etc put in. I just had BBR redo basically everything. It fixed the problem and I'm going to pick it up today.
#16
On The Tree
Join Date: Sep 2010
Location: Dunedin, Florida
Posts: 198
Likes: 0
Received 0 Likes
on
0 Posts
not a completely true statement at all... if they have a aftermarket cam most of them are made for different years and the pin is different between the vented and non vented opti. So may have to cut the pin if your running a non vented opti.