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04-29-2019, 04:03 PM | #1 |
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351 Driving Me a Little Nuts
Not as interesting as other threads but here it goes...
I have a '87 F250 which came with a carb. Over the years the pollution stuff has been disconnected as well as parts have died. I had the original carb rebuilt a few years back but it always ran rich. A month ago I finally bit the bullit and had a Holley 600 installed. The shop I took it too regularly works on carb equipped vehichles. They installed the Holley and it runs much better. The throttle return spring is a bit heavy but I will change that. Now for the advice... It is a bit of a struggle to get started. It sits for a week or more at a time and I pump it twice to activate the choke and to give it a squirt of gas. I may have to repeat this a few times bu eventually it runs at fast idle to war up. When I put it into gear it dies and I try again and eventually, though a little quicker, it runs. After about fifteen to twenty minutes of driving al is well. The shop removed the EGR when they installed the carb. Any ideas/solutions? Thanks in advance! |
04-29-2019, 04:28 PM | #2 |
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Re: 351 Driving Me a Little Nuts
I have a 1981 351m in my F250 and it runs a lot rougher than my 1955 crown victoria - which boggles my mind since it has an added advantage of almost 30 years of technology advances. I'm still learning my F250, but assuming its the same design does your vacuum motor in the air cleaner snorkel work? that draws in air warmed by the exhaust manifold until the engine warms up, after which cold outside air is funneled in. Mine runs, but isnt happy until warmed up. also, from what i've read, the PCV system should still be present and not messed with. And vacuum leaks are always a possibility.
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04-29-2019, 04:37 PM | #3 |
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Re: 351 Driving Me a Little Nuts
Something easy to start with...
Have you checked to see if the new carb is running lean or rich? A quick test is the color of the soot deposits just inside the end of the tailpipe, and confirmed by the color of the sparkplugs. The choke may be set a bit too lean, possibly the main jets also? |
04-29-2019, 05:12 PM | #4 |
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Re: 351 Driving Me a Little Nuts
Could you elaborate on what the colors are/mean?
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04-29-2019, 06:44 PM | #5 |
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Re: 351 Driving Me a Little Nuts
In general, black is too rich and white is too lean.
A light brown or tan is about right. Here's a link with images and descriptions.... https://speedmaster79.com/support/ho...r-spark-plugs- . Last edited by dmsfrr; 04-29-2019 at 06:55 PM. |
04-29-2019, 09:15 PM | #6 | |
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Re: 351 Driving Me a Little Nuts
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Quote:
Thanks for the tip. I'll see what I can do or maybe take it back to the shop. It does idle a bit high once it has warmed up and it do s have a RV cam. |
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04-29-2019, 10:19 PM | #7 | |
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Re: 351 Driving Me a Little Nuts
Quote:
Also make sure the choke is closing completely when the engine is cold. It may be set too loose. Align the choke cap with the center notch to start with. If the carb has an external pull-off, it may be pulling the choke too far open when the engine first starts. |
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04-30-2019, 04:34 AM | #8 |
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Re: 351 Driving Me a Little Nuts
This is a 351W/5.8L carbed engine, the factory carb a H4180 and it was replaced by a HOLLEY 4160?
How did they defeat the EGR (specialty spacer-different intake)? Can you provide a photo of the install? BTW- 40 Deluxe's description is right-on if it is a choke setting problem. |
04-30-2019, 07:06 AM | #9 | |
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Re: 351 Driving Me a Little Nuts
Quote:
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05-01-2019, 07:27 PM | #10 |
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Re: 351 Driving Me a Little Nuts
I'll be getting back to this nearer the weekend. Thanks for all the replies so far! Stayed tuned...
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05-01-2019, 07:50 PM | #11 | |
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Re: 351 Driving Me a Little Nuts
Quote:
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05-05-2019, 11:22 PM | #12 |
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Re: 351 Driving Me a Little Nuts
I poked around over the weekend at my engine. I'm thinking it's the choke so I'm going back to the shop and let them sort it out. I'll keep you all posted.
Last edited by Fortunateson; 05-06-2019 at 08:50 AM. |
05-06-2019, 09:07 AM | #13 |
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Re: 351 Driving Me a Little Nuts
Just a little thing that it wouldn't hurt to double check... (photo)
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05-07-2019, 12:32 AM | #14 |
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Re: 351 Driving Me a Little Nuts
Thanks for that tip. I haven't opened it up but the shop said it will have to be next week. Maybe I'll review the set up procedure for chokes as I haven't done on in years and have a go.
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05-08-2019, 01:41 PM | #15 |
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Re: 351 Driving Me a Little Nuts
Did they change the manifold or did the Holley bolt up to the existing manifold? An increase in rpm is an indicator of a possible vacuum leak as a general rule especially if it started out normal and then increased in rpm over time. A lean condition may be another possibility due to some fuel passage partial blockage somewhere internally.
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05-08-2019, 06:16 PM | #16 |
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Re: 351 Driving Me a Little Nuts
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05-11-2019, 12:09 AM | #17 |
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Re: 351 Driving Me a Little Nuts
I got the instruction sheet when I bought the carb. I believe that the Holley needs a constant 12v supply but I'm not sure. Got really busy around here lately.
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05-11-2019, 08:00 AM | #18 | |
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Re: 351 Driving Me a Little Nuts
Quote:
Once properly adjusted (and before ethanol gasoline), one should be able to depress the fuel pedal fully and release and the car should start and run on it's own. Can you tell me the HOLLEY MODEL NO.? |
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05-13-2019, 09:29 AM | #19 |
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Re: 351 Driving Me a Little Nuts
How old is the fuel pump and is for a carbureted engine? There may be a difference, plus if the pump is old it may allow gas to drain back into the line and tank.
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05-13-2019, 11:05 AM | #20 |
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Re: 351 Driving Me a Little Nuts
Fortunateson,
I have an NOS Holley for an '86 Ford truck 351W. Part number E6HE-9510-AC. Holley number LIST 50305-2. Carb has always been in a heated house since new. Appears as new. If it comes to that point, just letting you know I have one (actually two). Sal |
05-16-2019, 08:54 PM | #21 |
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Re: 351 Driving Me a Little Nuts
Thanks for the offer Sal. I just got the truck back from my mechanic. I was going to fiddle with it myself but all of a sudden retired life got really busy. Anyway they adjusted the choke a wee bit and it seems really good. Now I'll see Howe it goes when I leave it for a week or two as it was a reall burger to get started in those situations. Almost like the fuel was draining out of th Efteling bowl. We'll see how it goes...
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05-16-2019, 10:32 PM | #22 | |
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Re: 351 Driving Me a Little Nuts
Quote:
You could double check the output pressure & flow of the fuel pump. . Last edited by dmsfrr; 05-16-2019 at 10:42 PM. |
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05-19-2019, 07:29 PM | #23 |
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Re: 351 Driving Me a Little Nuts
I would be surprised if you don't have to grind on it after a couple of weeks sitting. It is the nature of a carburetor. If it bothers you, you can install a flow-through electric fuel pump back near the tank to prime the carburetor after the truck sits for more than a few days.
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05-20-2019, 05:32 AM | #24 | |
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Re: 351 Driving Me a Little Nuts
Quote:
Also, a mechanical fuel pump will not hold line pressure over time. The fuel in the pump to carb line drains back to the tank and the pump may take a while to prime. Same as starting an engine having to either prime the fuel bowls and/or having to dribble a little fuel into the carb throat making the engine catch enough to allow the pump to prime itself. |
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05-29-2019, 07:01 PM | #25 |
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Re: 351 Driving Me a Little Nuts
Good idea, will do. Truck running fine now though I think the idle speed setting is a tiny bit too high.
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05-29-2019, 07:02 PM | #26 |
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Re: 351 Driving Me a Little Nuts
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06-15-2019, 09:15 AM | #27 |
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Re: 351 Driving Me a Little Nuts
Thought I should up-date. All is good and thanks for all the advice!
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06-15-2019, 11:53 AM | #28 |
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Re: 351 Driving Me a Little Nuts
What condition did you finally find?
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06-15-2019, 03:20 PM | #29 |
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Re: 351 Driving Me a Little Nuts
Well to be honest I took it back to the shop and let them do it. After all I was way to busy at the time and I paid them to install and adjust. They said they just adjusted it and that's fine with me!
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06-15-2019, 03:48 PM | #30 |
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Re: 351 Driving Me a Little Nuts
That's OK. Sounds like a simple choke adjustment.
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06-17-2019, 05:46 PM | #31 |
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Re: 351 Driving Me a Little Nuts
I could tell you a story on what I did to my 351 W. but you couldn't get it inspected and the dealer I sold it to was really P.Oed when he found out the parts were aat my EX-wifws house. Don't know why he just didn't go get them. LOL Al
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06-17-2019, 06:38 PM | #32 |
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Re: 351 Driving Me a Little Nuts
I am the original owner of my 1986 F-250 with 351 engine. It always starts quickly even after setting a month. It runs perfectly in cool weather and in winter cold weather. It has severe hesitation and almost stalls when driving in warm weather. My mechanic rebuilt the original carburetor which is still on the truck, but there was no change. As i remember there was a recall when the truck was new regarding the intake manifold, and the recall was performed by the selling dealer. As my only need for the truck is in the summer I am fed up with its hesitation antics. Recently it hesitated and then quit entirely while driving. AAA flatbedded it to my mechanic who found the problem was unrelated to the hesitation and was rodent eating the gas line near the top of the forward tank (it has dual tanks). I was quoted $800 for a new carburetor but I need the truck so seldom it is going to leave home, asking $650.
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06-17-2019, 09:11 PM | #33 |
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Re: 351 Driving Me a Little Nuts
Barnstuf, if your interested, I have two NOS Holley four barrel carbs for an '86 Ford truck with a 351W engine. Holley number is E6HE-9510-AC. Holley number LIST 50305-2. You can have for a heck of a lot cheaper than the $800 one you mentioned.
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09-03-2020, 09:06 AM | #34 |
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Re: 351 Driving Me a Little Nuts
How much extra to deliver to Alabama?
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