Holley Sniper Tuning (2 Viewers)

[midknightc3]

This seems a good place to post instead of starting a whole new thread. Just installed a 2300 from Mosley on my wife's 74ish (she's a mutt) FJ40. Damn thing runs better than my 60 which I installed a 2300 on years ago. Theres a significant caveat to this however, she's really hard to start. Currently I'm running the stock Holley config, with the exception of bumping the the initial shot of fuel to 200%. She takes multiple seconds of cranking to finally fire (thought she just needed more "choke", hence the 200%, but this didn't change anything) and once running we can't take our foot off the peddle for the first few minutes or the engine immediately dies. Once it has warmed up a bit (it's in the 40's at night now) and gets somewhere between 90-110 CTS, she'll idle just fine. However, even once filly warmed up, if we turn the key off and then restart, the engine idles ~350RPM for ~5sec before the system catches up and bumps the idle up to where I set it at 750RPM. IAC with the truck fully warmed up is 4-9% (seems to change every time we start it). but has a surging issue of ~2% while idling. I've sprayed carb cleaner everywhere looking for a vac leak and had absolutely no response from the engine. Disconnected and plugged the vac lines going to the PCV and dizzy advance to rule those out as a leak source and no change in anything. I looked at the IAC Parked setting thinking it just needs more IAC, but it should be 100% at startup (including a photo of the temp/IAC graph). Hard to tell what's going on with this because IAC is parked at 20% since we have our foot on the throttle to keep the engine running. Sorry if this is a lot to read, just trying to include as much info as I can that I think pertains. Any thoughts? I have not tried the strong tape method of setting the idle yet, though maybe that should be my next step.

Thanks!
Clark

 

[wngrog]

Have you checked your timing? I’ve had to go as much as 16* on a motor to get it to run correctly. Hard start cold like that sounds like you may be a bit retarded in your timing.

Easy to check

 

[midknightc3]

Yes, I have her at 13*.

 

[jhsmith]

I had a similar issue until I fixed the timing. Line it up to the BB at idle. Or better yet, try the Holley HyperSpark. I eventually went that route and am happy with it.

Mosley sells a kit or zerotreedelta has a thread with instructions on how to adapt the distributor.