24x setup isn't running
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
24x setup isn't running Alright so the car cranks and does fire off, but then dies. I can kinda keep it going if I mess with the throttle.
So what could be off?
So what could be off?
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
Yeah I guess we are kinda discussing the problem in his thread.
I have 39 PSI at idle and then it spikes to 42 when it tries to die. Since I started this thread it will run, it runs stable for a second or two, then it tries to die, then it comes back, it does this continually.
I have 39 PSI at idle and then it spikes to 42 when it tries to die. Since I started this thread it will run, it runs stable for a second or two, then it tries to die, then it comes back, it does this continually.
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Thread Starter
Joined: May 2006
Posts: 3,974
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From: Spring Hill, FL
Video. Excuse me swearing at the dog and then laughing about it at the end once I realized the camera was still recording.
I'll try to get a video tomorrow during the day, I just got the camera back so I figured I'd throw this up.
I'll try to get a video tomorrow during the day, I just got the camera back so I figured I'd throw this up.
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Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
Yep Doc did the base tune. He suggested I reset the TPS? I do have a question on the vacuum lines. I know the stock harness I disconnected one off of this little canister thing but the fitting in the new harness didn't really fit? I'll get some pictures of that in the morning.
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
Have you scanned the pcm yet? Is it Mikes harness or your own? Are you running a MAF or speed density tune, have you scanned the PCM for fault codes? On my 93, the PCM will set SES fault codes with out illuminating the light on the cluster. I noticed you said mail order tune, but you really need some thing like HPtuners or similar to scan the PCM. Mike has bad *** customer service and helped us out with my swap, but you need to be able to give him data so he can help you. My car wouldn't run in speed density till it had the enhanced OS from HPtuners.
Last edited by BizZzatch350; Nov 28, 2010 at 01:10 PM.
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
It has a hotcam, stock heads that were milled and 36# seimens/deka injectors. I had included a sheet when I mailed the PCM with all the modifications and other info like tire size, rear gear, longtubes, etc...
So is there some way to physically raise the idle then?
I did try to reset the TPS, I followed Doc's instructions, but I may not have left the battery unhooked long enough. He told me to put the key to run, unplug the TPS, and then unhook the battery. But maybe I needed to unhook the battery longer.
So is there some way to physically raise the idle then?
I did try to reset the TPS, I followed Doc's instructions, but I may not have left the battery unhooked long enough. He told me to put the key to run, unplug the TPS, and then unhook the battery. But maybe I needed to unhook the battery longer.
Last edited by camar0corey; Nov 28, 2010 at 02:14 PM.
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TECH Regular
Joined: Jan 2005
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You are running a rather large injector (assuming they are 36# at 42psi) for your engine combo. Oversized injectors can cause surging at idle. But you should be able to have your PCM tuned with those injectors.
As info...my LT4 hotcam SBC has Vortec heads, Ram Jet 350 intake 1.6 rockers, and plenty of fuel with 24# injectors.
Thread Starter
Joined: May 2006
Posts: 3,974
Likes: 2
From: Spring Hill, FL
They are the same injectors I was running on the LT1 PCM though, been driving fine with that combination for almost 2 years now. I am going to email Doc again, I wonder if they keep logs of the tunes they did? Then I can see if it were tuned for LT1 pressures or LS1 pressures.
I'll try to raise the idle then next.
BizZzatch350, it is a MAF tune, harness by Mike. Agreed he definitely has great customer service! I had the mail order tune done by EFI Alchemy, as they have done several 24x setups. The plan was to get it running and then head up there for a dynotune. Not sure what Doc uses to tune, whether it is hp tuners or efi live. Trying to find someone local with either so I can see what is going on, no luck yet though!
I'll try to raise the idle then next.
BizZzatch350, it is a MAF tune, harness by Mike. Agreed he definitely has great customer service! I had the mail order tune done by EFI Alchemy, as they have done several 24x setups. The plan was to get it running and then head up there for a dynotune. Not sure what Doc uses to tune, whether it is hp tuners or efi live. Trying to find someone local with either so I can see what is going on, no luck yet though!