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BrokenToy
01-28-2009, 07:30 PM
anybody familiar with the dual setup of gas & propane?

here's the scenario:
runs fine on gas, no problems whatsoever
when runnin on propane, tends to stall out when i've been usin a fair bit of throttle and then let off the gas and coastin
example: comin off of hwy (been doin 90-100 km/h) and then come up to a stop light, she will sometimes stall out. sometimes will start again on propane or i hafta switch to gas to get it started again

any help is much appreciated [cheers]

Rdnk_Wmn
01-28-2009, 07:34 PM
Mine's the same way, going to a propane specialist tommorow afternoon, i'l let you know what they say.

You may have air bubbles in your tank or something, and if so, you'd need to get your tank purged ( this is what he said it may be, on the phone)

FU Toolbag
01-28-2009, 08:21 PM
Mine's the same way, going to a propane specialist tommorow afternoon, i'l let you know what they say.

You may have air bubbles in your tank or something, and if so, you'd need to get your tank purged ( this is what he said it may be, on the phone)

Well someones ready to through their money away.

Your pickup is at the bottom of the tank, unless like a friend of mine and you put the tank in upside down. it is designed to draw only liquid from the tank. The spitter takes it's gas from the top of the tank. The first time you fill it, it's purdged. It's just like when you buy a new 20lb tank, they charge you another 12 to purdge. They could kiss you first, but your getting fucked.

As far as the original problem goes, check your coolant level. The evaporator uses the heat from the engine to thaw the liquid propane into a vapor. if you don't have enough coolant, it will allow the evaporator the freeze. If you pop your hood and it's frosted over, just park and wait. Whatever you do, don't pour water on it, it will become a block of ice, then you got a couple hours to wait on the side of the road.

This is one reason I run the coolant through the evaporator then the heater core. If you think you have a problem, crank the heat up. If you have no heat, the evaporator doesn't either. Pull over and top it up asap, or your sittin.

I'm not real knoledgable on the dual fuel setups, but they usually suck at both. what is your setup?If your not sure, just describe then, or better yet, post up a pic of your setup.

You also could be out of propane.:happy0045:

Murd0c
01-28-2009, 08:25 PM
I shall find out tomm for ya Johnny ;)

automan
01-28-2009, 08:26 PM
check your regulator,might need adjustment or cleaned out
check for coolant flow through it

whazhappenin69
01-28-2009, 08:47 PM
I'm going to have to say that I highly doubt the air bubble theory......sounds like a good excuse for the shop to make money....
First make sure there is a good vacume source to the lockoff and the vacume lines are not cracked or loose. If vacume drops off during deceleration the lock off may shut the flow of propane off thus stalling.
A few other ideas....
Most likely the mixer will need to be taken apart and cleaned, when it's apart inspect the diaphram and replace it if it is cracked or hard. Sometimes but less often the diaphram in the heater/vaporizer needs to be replaced.
The filter in the lockoff can sometimes become pluged and cause lack of power under load and many cause other problems like stalling....
If you have an IMPCO system google it up, there is ton's of great information on line..
If you don't want to work on it yourself just study the infomation and familliarize yourself with the components before you take the truck in to the shop. At least then you will have some idea of how the propane system works and you will be less likely to get ripped off. Propane is a specialty like auto transmissions and most shops use this to their advantage to bend you over and give it to you dry.......

Just my 2cents.

Murd0c
01-29-2009, 11:36 AM
if you can tell me type model and year of vehicle it's on as well as what brand propane system your running I can tell you how to fix it [cheers]

BrokenToy
01-29-2009, 06:08 PM
thanks for the input [cheers] will have to check a few things out

it's a 92 chev 1500, but unsure of which propane system as it was put in about 15 years ago. will take a look and go from there

thanks again and no it's not out of propane [1e]

Murd0c
01-29-2009, 07:05 PM
go take a look and find out [f] if you tell me I can find out how to solve your problem tomm at work

BrokenToy
01-29-2009, 09:39 PM
all i can find for markings is a sticker saying it's a bc certified propane system 1075 and serial # 77743
:dontknow:

OldEnuff
01-30-2009, 12:15 AM
If you are low on coolant it will do exactly what FU250 said when you decelerate (lower rpms)
At high rpm even if you have low coolant it will still spit enough through the lines to give you some heat and heat the vaporizer as well but when you drop to idle speed (decelerate) the coolant flow temporarily stops passing throught the system and your vapourizer will either not do its job correctly (bog down) or freeze up completely and not work at all.

I know this from experience with an impco system on my '87 Bronco


so first make sure you have adequate coolant and go from there

OldEnuff
01-30-2009, 12:17 AM
Both the vaporizer and the lockoff should have the mfg name and a part/model number on them somewhere

vajayjay
01-30-2009, 05:29 AM
You got a truck again so you can drive yourself up to stave again:happy0045:

Murd0c
01-30-2009, 08:15 AM
look on the regulator and lockoff there will be a impco/ohg etc stamp saying which company made your propane system you are running.

FU Toolbag
01-30-2009, 04:04 PM
Or just take some pix. there's not that many systems.

FU Toolbag
01-30-2009, 04:06 PM
all i can find for markings is a sticker saying it's a bc certified propane system 1075 and serial # 77743
:dontknow:

that has nothing to do with your system. That's just to let you get fuel.