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Baja Forums -:- VW Volkswagen Bug, Baja, Bus, Sandrail and Thing -:- VW Volkswagen & Baja Bug General Discussion -:- Motor issues
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Motor issues
Bug, Baja, Thing and Buggies. Most every thing that will not fit any any other area. See list of other Forums for better topic placement...Volkswagen General Discussion
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Dirtjunkie
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Post Post subject: Motor issues
Posted: Sun Sep 11, 2016 06:55 PM
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So we have a 1641, big valve heads, mild cam, 40 Weber carb, carb has been rebuilt, new intake boots and seals, new distributor, & wires. Runs rough & backfires at idle, will run smoother if you place you hand mostly over driver side of carb, bit still has minor backfire, also backfires at RPM, #1, and 4 plugs show lean, 3&2 show fine. I'm stumped anyone have any ideas?


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Dalton
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Post Post subject: Motor issues
Posted: Mon Sep 12, 2016 01:33 PM
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spray oil on the intake parts until it runs better. that will help to find your leak.

maybe you have the wrong jets on one side of the carb?


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Dirtjunkie
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Post Post subject: Motor issues
Posted: Mon Sep 12, 2016 02:20 PM
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Its the same setup we have used for a couple years now, so jets are not an issue, but I am thinking it may be a fuel flow issue, there never seems to be much fuel in the filter and it doesn't seem to fill up ever. Going to pull the fuel line tonight and crank it over to see how the flow is.


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Suspension is the key to going fast off-road. Without it, a big motor is a waste of power and gas.
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JWHracing
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Post Post subject: Motor issues
Posted: Mon Sep 12, 2016 06:21 PM
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40 IDF? What does it have for a fuel pump? Does it have a regulator? Single IDFs like between 2.5-3psi of fuel, nothing more or less. Any more than that and it will bypass the needle and seat and flood all the time. What size idle jets? Make sure they're clean, they plug easily. I'd also take the filter off and make sure the idle jet vents in the top of the carb are clean as well. When mine backfires/pops it usually means one of the idle jets is dirty. Sometimes takes a few times to clean all the crap out of them. I've changed jets, started the car and put it on the trailer. Got to the destination and unloaded and the car runs like crap. Just how they work sometimes.


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Dirtjunkie
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Post Post subject: Motor issues
Posted: Mon Sep 12, 2016 09:40 PM
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Yes 40 IDF, Carb has been cleaned 3 times with the same result, rebuilt the carb with a fresh rebuild kit last time I cleaned it same result. fairly new stock fuel pump, brand new in line fuel filter and new filter in carb, fresh gas and tank is clean. Checked all the jets yesterday and they were all clean, blew everything out with compressed air. This is why I'm stumped, and thinking fuel flow.


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A very wise man once said:
Suspension is the key to going fast off-road. Without it, a big motor is a waste of power and gas.
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JWHracing
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Post Post subject: Motor issues
Posted: Mon Sep 12, 2016 11:41 PM
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What size Idle jets?


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Dirtjunkie
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Post Post subject: Motor issues
Posted: Tue Sep 13, 2016 02:25 PM
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Not sure, Ill look when I get back to work on it, maybe tonight. I didn't build the set up my brother did, it has worked great for several years just has this issue now.


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A very wise man once said:
Suspension is the key to going fast off-road. Without it, a big motor is a waste of power and gas.
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JWHracing
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Post Post subject: Motor issues
Posted: Tue Sep 13, 2016 03:51 PM
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Has it always had this same set of heads and cam? Could be a tuning issue now. What are you running for valve springs, single or dual?


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Dirtjunkie
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Post Post subject: Motor issues
Posted: Wed Sep 14, 2016 03:16 PM
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Cleaned all the jets again last night runs better especially at idle, but still stumbles at RPM, but that could be due to a non charging generator, ( which I just found out about last night) going to swap it out when I get a chance and see what happens.


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A very wise man once said:
Suspension is the key to going fast off-road. Without it, a big motor is a waste of power and gas.
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Dalton
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Post Post subject: Motor issues
Posted: Wed Sep 14, 2016 11:55 PM
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I hate carburetors... I could never get them to work right...


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Dirtjunkie
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Post Post subject: Motor issues
Posted: Thu Sep 15, 2016 02:28 PM
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Well it isn't the charging system, looks like I need to pull the carb apart again, at RPM it sound like its running out of fuel popping, sputtering and really loud backfiring, something must be blocked.


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Current AZBaja"El Presidente"

A very wise man once said:
Suspension is the key to going fast off-road. Without it, a big motor is a waste of power and gas.
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Dirtjunkie
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Post Post subject: Motor issues
Posted: Mon Sep 19, 2016 02:19 AM
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Cleaned the carb again!, and she's running good, just got to drive the Vert for the first time in 15 years.


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Current AZBaja"El Presidente"

A very wise man once said:
Suspension is the key to going fast off-road. Without it, a big motor is a waste of power and gas.

Last edited by Dirtjunkie on Mon Sep 19, 2016 11:12 PM; edited 1 times in total
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vwboat
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Post Post subject: Re: Motor issues
Posted: Mon Sep 19, 2016 09:06 PM
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Good news on the motor

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