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Author Topic: Engine cuts out when warm  (Read 9780 times)

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fitter

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Re: Engine cuts out when warm
« Reply #45 on: August 29, 2020, 07:39:03 AM »
Jay suggested same. Will try that as well thx
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fitter

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Re: Engine cuts out when warm
« Reply #46 on: August 29, 2020, 10:12:52 AM »
Tried a few suggestions this morning since temps are cooler.  As usual when accelerating hard it fell flat. Fuel pres remained at 6 psi. Got out and popped gas cap, no vacuum . Hooked 12 volt jumper to coil, no change. After initial falter as soon as I would try to accelerate it would just die. Limped it home surging at low rpm.
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Cyclone03

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Re: Engine cuts out when warm
« Reply #47 on: August 29, 2020, 11:34:33 AM »
Very interesting timing, Engine Masters just did a show on ignition...

Plug wires,plugs ,then coil. they swapped in an MSD and ran it with a Chrysler Box, it was failing and would not repeat, then full MSD.

But you have swapped in new plus hot wired it to bypass ignition switch.

I think JDC mentioned fuel breaking down the hoses,I had a problem when I put a RobbMc fuel pump on ,the fuel would foam. The fuel line from the tank to hard line had broken down and it would suck air.

If you get fuel injection rated hose it should be ethanol safe.
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Lance H

fitter

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Re: Engine cuts out when warm
« Reply #48 on: August 29, 2020, 01:26:19 PM »
Changed the hoses already.  Gonna change filter again thx
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shady

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Re: Engine cuts out when warm
« Reply #49 on: August 29, 2020, 03:16:09 PM »
did all this happen after the timing chain change out?
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fitter

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Re: Engine cuts out when warm
« Reply #50 on: August 29, 2020, 04:41:05 PM »
No timing chain was replaced 10 years a go when stock cam was replaced. Only about 1000 miles on it.
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70tp

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Re: Engine cuts out when warm
« Reply #51 on: August 29, 2020, 06:36:07 PM »
Sure sounds like foaming fuel/vapor lock to me
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Joey120373

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Re: Engine cuts out when warm
« Reply #52 on: August 30, 2020, 04:30:48 PM »
I agree, sure “sounds” like fuel starvation.

Any way you can monitor the fire pressure while your driving?
Pressure could be just fine when idling but drop off under load.

Sounds like you’ve been through the fuel system a few times, so it’s perplexing.

Had a fuel
Line on my f250 that had gotten soft and squishy, probably from the modern gas we get.
It didn’t cause any issues till I took it out on the highway and hit 70mph for a bit. Then the truck started surging. It was the line going into the pump. It linked enough to starve the engine at sustained loads. Normal round town driving it was fine.
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fryedaddy

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Re: Engine cuts out when warm
« Reply #53 on: August 30, 2020, 05:51:59 PM »
maybe your jets in your secondary's are way too small+ may have powervalve blocked in rear too. it happened to me .i bought a 950 off a guy,threw it on my 428 and it sounded great idling.when i took off down the road it fell flat.it had 60s size jets in front and rear with  power valve blocked.after jetting up about 20 sizes it ran great.
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C6AE

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Re: Engine cuts out when warm
« Reply #54 on: August 30, 2020, 05:59:53 PM »
I have observed (more than once) the inner lining of the fuel hose from tank to pump collapse and suck flat under vacuum, impossible to see it in operation.
Fuel injection rated hose is rated for pressure, not vacuum.
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Yellow Truck

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Re: Engine cuts out when warm
« Reply #55 on: August 30, 2020, 06:56:11 PM »
Not saying this is your problem, but this is what a squirrel can do. Didn't know till I fired it.

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fitter

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Re: Engine cuts out when warm
« Reply #56 on: August 30, 2020, 07:22:08 PM »
Update. Tried numerous suggestions.  None seemed to help.  Pulled second rebuilt 735 off and installed a ebock 600 off another engine. Other than a hesitation when I jump on throttle it ran fine for a good hour today.  Took home and pulled unilite I installed last weekend and put pertronix conversion dist back in.  It started acting up again. Not sure I had pertronix timed properly. May reinstall it again next weekend to confirm that its an issue. Thx
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My427stang

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Re: Engine cuts out when warm
« Reply #57 on: August 31, 2020, 08:59:11 AM »
Quote from: fitter on August 30, 2020, 07:22:08 PM
Update. Tried numerous suggestions.  None seemed to help.  Pulled second rebuilt 735 off and installed a ebock 600 off another engine. Other than a hesitation when I jump on throttle it ran fine for a good hour today.  Took home and pulled unilite I installed last weekend and put pertronix conversion dist back in.  It started acting up again. Not sure I had pertronix timed properly. May reinstall it again next weekend to confirm that its an issue. Thx

It's incredibly tough without being there, but assuming the Pertronix/Unilite swaps are repeatable, then there you go.  However, get a timing light on it each time to rule out variables

(Assuming the distributor wasn't the issue) Is there any way you could put a little pusher electric fuel pump, even if just temporarily wired?  The difference between the 600 and Holleys is total fuel volume in the bowls, the Holley and slosh in the rear bowl, and overall fuel required when using all the CFM.  Something to think about after you make a decision on the distributors

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Ross
Bullock's Power Service, LLC
- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, Erson SFT cam, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 461 cid FE, headers, Victor Pro-flo EFI, Comp Custom HFT cam, 3.50 9 inch

fitter

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Re: Engine cuts out when warm
« Reply #58 on: August 31, 2020, 10:21:34 AM »
Thx Ross. Im getting good a t swapping distributors. I will try pertronix again. What should i set timing at.  Stock cj  87 octane   Thx
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My427stang

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Re: Engine cuts out when warm
« Reply #59 on: August 31, 2020, 12:14:28 PM »
Quote from: fitter on August 31, 2020, 10:21:34 AM
Thx Ross. Im getting good a t swapping distributors. I will try pertronix again. What should i set timing at.  Stock cj  87 octane   Thx

12 initial, vacuum disconnected, is a good enough WAG to rule out a problem.
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---------------------------------
Ross
Bullock's Power Service, LLC
- 70 Fastback Mustang, 489 cid FE, Victor, SEFI, Erson SFT cam, TKO-600 5 speed, 4.11 9 inch.
- 71 F100 shortbed 4x4, 461 cid FE, headers, Victor Pro-flo EFI, Comp Custom HFT cam, 3.50 9 inch
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