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Author Topic:   Engine keeps dying on yellow flags
xhubby
Dirt Freak

Total posts: 376
posted July 24, 2005 03:21 PM  
What the heck could be causing our motor to die at low RPM's,(2000), on yellow flags? We've been through the wiring, changed the modual in the distributor, & have gone through the complete fuel system except for the fuel pump. It runs great at race speed. It does not blubber or stumble before it dies, it just shuts off. If we keep it at about 3000 RPM, it runs fine. We are running a 4412 holley 2 barrel on gas with a holley fuel pump. Anybody have any ideas? Thanks.

jracer
Dirt Roller

Total posts: 20
posted July 24, 2005 07:04 PM  
Had a similar problem on a similar engine. It turned out to be the reluctor. It's below the weight plate and is circular w/8 raised triangles around the perimeter. You have to take the gear off and the shaft out to get it out.
Jay

leapinlizard
Dirt Freak

Total posts: 402
posted July 25, 2005 11:54 AM  
Lift off the rotor, unplug the two terminals that are connected to the reluctor. Hook up a digital volt meter up to the term. and crank hte engine. You should see at least 1 to 1.5 volt's. If not you dist. is junk. You can replace the reluctor but good luck finding one new.

ss99
Dirt Maniac

Total posts: 120
posted July 25, 2005 12:00 PM  
Actually, Napa carries the reluctors (also known as the pick-up coil) new. Take your old one in to match up the wires to the new one.

sc1 racing
Dirt Freak

Total posts: 419
posted July 25, 2005 04:02 PM  
a bent or twisted butterfly shaft will do the same thing. but it will do it unless you are on the gas even sitting on the trailor..does it do it just sitting there?

xhubby
Dirt Freak

Total posts: 376
posted July 25, 2005 07:37 PM  
sc1 racing, no it has never died just sitting in the garage idling. It started a couple of weeks ago when it completely fell on its face while running full throttle. The driver said it acted like it just loaded up real bad. It then came out of it, & ran perfect for the remaining 16 laps. I figured "fuel problem". We went through the complete fuel system,(except the fuel pump), & we found a loose fuel fitting in the cell on the pickup side. Thought we had it fixed. NOT. The next week, it just died twice during yellow flags. The next week, it didn't want to start before hot laps. Once it started, it died twice, then backfired through the carb. Finally got it started, & ran hot laps with no problems. Ran both the heat race, & the A-Feature without any yellow flags, & it ran perfect. This last week it died again during a heat race yellow, & just about didn't restart. In the A-Feature, the driver down shifted, & kept the RPMs up between 2500 & 3000 on 4 different yellows, & it ran fine. Every time it has died, it's been on a yellow flag at around 2000 RPMs. It runs great at higher RPMs. Sorry this is so long, but I figured the more info I give, the better chance of getting it figured out before this next weekend as we are currently second in points and closing. Thanks guys.

[This message has been edited by xhubby (edited July 25, 2005).]

sc1 racing
Dirt Freak

Total posts: 419
posted July 25, 2005 08:28 PM  
no oil getting in your distributer is there? also i wouldnt rule fuel pump out, or possibly a sticking float. also try a compression check wet and dry.

xhubby
Dirt Freak

Total posts: 376
posted July 27, 2005 04:10 PM  
sc1 racing, explaine the oil in the dist. thing please. I'm not much of a mechanic.

merlinmech2
Dirt Maniac

Total posts: 131
posted July 28, 2005 12:51 PM  
usually igniton shows at all or higher rpms. Kinda sounds like float too high. would check carb. first though.

A. Bighurry
Dirt Full Roller

Total posts: 35
posted July 28, 2005 04:05 PM  
It could be vapor lock. If your fuel line is too close to the headers, block, etc. you might be boiling the fuel under caution.

xhubby
Dirt Freak

Total posts: 376
posted July 28, 2005 05:39 PM  
We did check the float, & lowered it to where it just trickles out if you slightly wiggle the car.
Fuel line is nowhere close to any heat, plus, we have aviation insulation around it where it runs from the pump to the carb,(that's where it is the closest to the headers). Here's the strangest part of this whole deal, it has always died in the same location on the track. Right between the exit of turn 4, & the start/finish line. 6 or 7 times it's died, & every time in the same place.LOL

racing33A
Dirt Forum Racer

Total posts: 97
posted July 29, 2005 06:36 AM  
I know you said you checked the wiring. It sure sounds like some kind of intermitent electical problem to me. I would try another module just to be sure,and check my ground straps. From there I would probably check the master disconnect switch,the ignition switch, and then check for and loose or possibly shorting wires. Do you ran an alternator? If not is your battery good? Are the connections tight? Just some of the things I would be looking at. Hope it helps a little.
racing33A

madmodshoe
Dirt Maniac

Total posts: 195
posted July 30, 2005 10:09 PM  
Sounds like fuel to me quite Frankly! Just finished an episode with a bad fuel pump myself. Do you have a fuel pressure gauge in the car? have the boy keep an eye on it while under yellow. Could be a vaccum leak on the carb or gasket mating surface that ***** shut under full load. What do the plugs look like? They never lie, and your first intuition is usually correct. Good luck. let me know what you find! Steve.

xhubby
Dirt Freak

Total posts: 376
posted August 01, 2005 04:22 PM  
Helloooooo Steve, Good to hear from you!! Well this last weekend our problem bit us in the wazzoo big time. The car ran great in the heat race. Then while he was sitting in the staging area for the feature,with the car in nuetral, it died. It died 4 more time on yellow flags,(even when he down shifted to keep the RPMs up). It's never done that before. Then it died on a restart at about 3/4 throttle,(first time for that too), & left him sitting on the front chute. By the time he got it fired back up, he was a half a lap down. It ran perfect for the rest of the race,(no more yellows). He was hoping to win his 4th a-feature in a row. He thinks it's running out of fuel because of how it acts when he tries to restart it. He has to pump the throttle to get it refired, & there is no black smoke out of the headers like it was flooded. It's getting the carb gone through, & a new fuel pump this week. We've got 6 more features to win before this season is over. LOL!!

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