New engine won't idle
Thread Starter
Instructor
Joined: Dec 2004
Posts: 124
Likes: 0
From: Winter Haven Fl
New engine won't idle
New 6.3 stroker; AFR 215V2, Fast 102, prepped by Tony Mamo, NW 102TB
trying to start it on the 2004 corvette MAF that was tuned to a Fast 90 with a NW90mm TB. Installed new AC 41-104 plugs; fouled them out; installed NGK TR55's, car starts, will not idle below 1400RPM; just quits.
Rechecked valve lash, pulled FP fuse, disconnected injectors and checked cold compression 220-225psig all eight cylinders. Any help greatly appreciated
trying to start it on the 2004 corvette MAF that was tuned to a Fast 90 with a NW90mm TB. Installed new AC 41-104 plugs; fouled them out; installed NGK TR55's, car starts, will not idle below 1400RPM; just quits.
Rechecked valve lash, pulled FP fuse, disconnected injectors and checked cold compression 220-225psig all eight cylinders. Any help greatly appreciated
Thread Starter
Instructor
Joined: Dec 2004
Posts: 124
Likes: 0
From: Winter Haven Fl
I am going to install a 100mm MAF, but was told to see if it would run on the tuned 85mm from the old engine. I haven't checked for a vacuum leak, but when I pull the brake booster hose off, it definitely has vacuum. NGK TR55 gapped at .040 helped, but it will not idle below 14-1500 rpm. Camshaft is a 649/651 lift 227/231 LSL Comp on 1.8 shaft rockers.
Drifting
Joined: Sep 2009
Posts: 1,719
Likes: 4
From: cinnaminson n.j.
St. Jude Donor '14
Did you have a good tuner set you up with a base program? If not, you either need to
1. have a tune emailed to you and download with hp tuners
2. Send out your ECM and have it programmed and sent back for you to install
Either of these should get you in the ball park so you can safely run it at low speed/light load.
3. Flat bed your car for a Dyno tune.
You do not want to wash down the new rings with too much fuel! When I did my heads cam 346 with a fast 92 ans ls2 tb, I was advised to run my stock injectors and drive it easy to the tuning shop. It did not want to idle. It did run decent at 2-3000 rpm, so that's where I kept it. I do have an m6.
If it were mine, I would not run it at all until I talked to my tuner.
Good luck with it. It should be a beast!
1. have a tune emailed to you and download with hp tuners
2. Send out your ECM and have it programmed and sent back for you to install
Either of these should get you in the ball park so you can safely run it at low speed/light load.
3. Flat bed your car for a Dyno tune.
You do not want to wash down the new rings with too much fuel! When I did my heads cam 346 with a fast 92 ans ls2 tb, I was advised to run my stock injectors and drive it easy to the tuning shop. It did not want to idle. It did run decent at 2-3000 rpm, so that's where I kept it. I do have an m6.
If it were mine, I would not run it at all until I talked to my tuner.
Good luck with it. It should be a beast!
Thread Starter
Instructor
Joined: Dec 2004
Posts: 124
Likes: 0
From: Winter Haven Fl
Did you have a good tuner set you up with a base program? If not, you either need to
1. have a tune emailed to you and download with hp tuners
2. Send out your ECM and have it programmed and sent back for you to install
Either of these should get you in the ball park so you can safely run it at low speed/light load.
3. Flat bed your car for a Dyno tune.
You do not want to wash down the new rings with too much fuel! When I did my heads cam 346 with a fast 92 ans ls2 tb, I was advised to run my stock injectors and drive it easy to the tuning shop. It did not want to idle. It did run decent at 2-3000 rpm, so that's where I kept it. I do have an m6.
If it were mine, I would not run it at all until I talked to my tuner.
Good luck with it. It should be a beast!
1. have a tune emailed to you and download with hp tuners
2. Send out your ECM and have it programmed and sent back for you to install
Either of these should get you in the ball park so you can safely run it at low speed/light load.
3. Flat bed your car for a Dyno tune.
You do not want to wash down the new rings with too much fuel! When I did my heads cam 346 with a fast 92 ans ls2 tb, I was advised to run my stock injectors and drive it easy to the tuning shop. It did not want to idle. It did run decent at 2-3000 rpm, so that's where I kept it. I do have an m6.
If it were mine, I would not run it at all until I talked to my tuner.
Good luck with it. It should be a beast!
Race Director
Joined: Jan 2008
Posts: 16,028
Likes: 170
From: oregon
absolutely need to tow the car to a tuner if the engine wasn't dyno or street tuned by someone smart.
i've seen guys blow up motors running stock maps on modded motors thinking it will be okay for awhile
