desmocruiser
SILVER Star
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
Yeah I checked everything, replaced a couple of vacuum caps and resealed the base to make certain. I may run a new vacuum line between the advance and front of throttle body to make sure there isn’t a hairline crack I couldn’t see, feel, or get carb cleaner into.Can’t remember but have you checked for vacuum leak and loose hardware at the manifolds? Carb clean will find it.
you’ve taken the brake booster off line? Double checked the wiring coming off of coil like Cam suggested?Yeah I checked everything, replaced a couple of vacuum caps and resealed the base to make certain. I may run a new vacuum line between the advance and front of throttle body to make sure there isn’t a hairline crack I couldn’t see, feel, or get carb cleaner into.
Double checked the wiring, haven’t opened the cap, rerun vacuum hose from the advance or disconnected vacuum from the brake booster, next on the list.you’ve taken the brake booster off line? Double checked the wiring coming off of coil like Cam suggested?
Also- i’d let her come up past the 160* before making any adjustments.Double checked the wiring, haven’t opened the cap, rerun vacuum hose from the advance or disconnected vacuum from the brake booster, next on the list.
@desmocruiser did you follow up on this? I would also check the power lead to the DUI, several folks run the DUI power via relay to make sure it gets what it needs.For the first Spider-Man, I would look heavily at the coil (-) to Sniper connection and the wire all the way to the Sniper. If nothing there I’d pull the cap on the distributor and see if anything weird going on with the pickup. Anything short of perfect
@Coolerman even sells a specific sub harness if you need one.@desmocruiser did you follow up on this? I would also check the power lead to the DUI, several folks run the DUI power via relay to make sure it gets what it needs.
I inspected to the best of my abilities, admittedly not very familiar, but looked good to my untrained eyes. Wiring seems simple, just one from the alternator and it is getting power, I assume since it ran power is moving to the ignition?….@desmocruiser did you follow up on this? I would also check the power lead to the DUI, several folks run the DUI power via relay to make sure it gets what it needs.
One more suggestion to add to my one from above that doesn't cost money. Take the air cleaner assembly off and look down the throttle body with it running (and revving) to make sure that the fuel mist looks even on both sides. It should be apparent if one isn't functioning correctly. It'll look like one is putting out twice as much fuel and the spray pattern won't look refined. And while you're there, watch the fuel pressure gauge while revving it. A lot of times the fuel pressure will be steady at idle but will drop under throttle. (you might have already done this, and I missed it) If you dive far enough in to check the fuel injectors, put a zip tie around where the connector mates to the injector to hold the two snug together. Sounds hokey, but it has been discussed a million times on the Holley forum, and this seems to be the preferred method of remedy. If it ran fine before, it's something fairly simple I'd bet.
I have checked and readjusted the timing a couple of times and it’s at the same setting the truck had always ran well, that was one of my initial thoughts. The rough running really doesn’t go away at any timing point.Is anyone else catching what sounds like a miss or timing issue?
It should be around 12, I traditionally have gotten it there and fine tuned to eliminate detonation and smooth power.What is your timing set to?
Doesn't Sniper react to an intake vacuum leak (i.e., increased MAP) by increasing fuel, resulting in higher idle RPMs?... Check your vacuum and guard against vacuum leaks around the intake manifold.
This is not an ignition issue.
Have you checked the plugs? Any chance they got fouled?
The numbers look right on the screen. The MAP is not hopping around too crazy like a vacuum leak would cause.
I really don't think you have ECU problems. It would not run that good.
Stumped along with you.