Annoying Problem Please Help
Thread Starter
STF veteran / 10 second club
iTrader: (14)
Joined: May 2003
Posts: 3,376
Likes: 1
From: New York
Annoying Problem Please Help Over the weekend, a buddy of mine and I installed the Holley-Weiand alumimum LS1 Intake and SVO 30# injectors. I also took out my throttle body, drilled the hole SLIGHTLY bigger (not much at all), and attempted to port it. I put some JB weld in the throttle body, and let it sit. It didn't come out very good (I think it was too liquidy when I put it in) ... so I removed it all, and just used the dremel and polished the inside of the throttle body, and removed all the dried JB weld.
When I started it after the install, it immediately jumps to around a 1,300 rpm idle. It idles really badly until it starts to warm up ... at which time it slowly moves up it's idle to around 2,000 - 2,500 rpms for a minute or two. Then, it will go back down to around 1,200 or so, the back up to 2k, then back, etc etc. Basically acting really irradically. I let it idle for awhile and then drove for around 20 minutes today, to see if it would learn it out, and it doesn't seem to have gotten any better.
I plan on getting it tuned on friday, but until then it is too much of a pain in the *** to drive. I figured it was not going to be the greatest idle, but this is much worse then I had thought. Anyone have any idea what is causing this? Is it just the higher injectors, or could it be that I got some JB Weld in that sensor on the throttle body?
Thanks guys.
When I started it after the install, it immediately jumps to around a 1,300 rpm idle. It idles really badly until it starts to warm up ... at which time it slowly moves up it's idle to around 2,000 - 2,500 rpms for a minute or two. Then, it will go back down to around 1,200 or so, the back up to 2k, then back, etc etc. Basically acting really irradically. I let it idle for awhile and then drove for around 20 minutes today, to see if it would learn it out, and it doesn't seem to have gotten any better.
I plan on getting it tuned on friday, but until then it is too much of a pain in the *** to drive. I figured it was not going to be the greatest idle, but this is much worse then I had thought. Anyone have any idea what is causing this? Is it just the higher injectors, or could it be that I got some JB Weld in that sensor on the throttle body?
Thanks guys.
Thread Starter
STF veteran / 10 second club
iTrader: (14)
Joined: May 2003
Posts: 3,376
Likes: 1
From: New York
Re: Annoying Problem Please Help Btw ... I have a a/f ratio gauge ... and during this whole ordeal, it is basically always showing a lean condition, which is opposite from what I would expect. Normally during idle it bounces from rich to lean constantly, now it just sits at lean until I press the gas, which it goes rich instantly.
TECH Enthusiast
Joined: Nov 2001
Posts: 521
Likes: 0
From: Farmingdale NJ
Re: Annoying Problem Please Help Sounds like a vaccuum leak somewhere past the MAF sensor. One of the O-rings on the intake runners isn't sealed, the TB gasket isn't sealed, or you may have damaged an injector O-ring. Also check the hoses on the back of the intake and the sensor as well as the brake booster hose. Could also be the EGR pipe (if you still have EGR).
Basicly anywhere there is an opportunity for air to enter, check it.
When you hit the gas the vaccuum drops and the uncalibrated larger injectors are probably dumping in a larger amout of fuel than the computer expects, sending you rich. Erratic idle and lean at idle are often signs of a vaccuum leak so I'd start with that.
Propane can be used to find a vaccuum leak but if you're not experienced with that sort of thing it can be a little dangerous so I'm not going to suggest or advise you in methods of doing so. I'm sure your tuner will be able to straighten it out for you on Friday though
Basicly anywhere there is an opportunity for air to enter, check it.
When you hit the gas the vaccuum drops and the uncalibrated larger injectors are probably dumping in a larger amout of fuel than the computer expects, sending you rich. Erratic idle and lean at idle are often signs of a vaccuum leak so I'd start with that.
Propane can be used to find a vaccuum leak but if you're not experienced with that sort of thing it can be a little dangerous so I'm not going to suggest or advise you in methods of doing so. I'm sure your tuner will be able to straighten it out for you on Friday though
Thread Starter
STF veteran / 10 second club
iTrader: (14)
Joined: May 2003
Posts: 3,376
Likes: 1
From: New York
Re: Annoying Problem Please Help I just used some carb cleaner to check it out, and there was a leak in the front of the intake ... i blue'd it and saw that it was actually machined wrong from holley, and there was no way it was sealing the whole time ... So I'm a little pissed, but whata'ya gonna do. I'll order me an LS6 intake tomorrow.
Thanks for the help.
Thanks for the help.
