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10-10-2021, 05:57 PM
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#29
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Senior Member
Join Date: Jul 2013
Posts: 258
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Another possible source of excess fuel to one cylinder bank or the other is through the evaporative emission system which consists of a charcoal canister, a purge valve and possibly some other components. I am not sure your vehicle has this system but if it does depending on where the hose from the purge solenoid valve connects to the intake plenum might cause black smoke to appear from one cylinder bank or the other.
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Fred & Darla 2000 Tropi-cal and 2016 Chevy Sonic toad
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10-10-2021, 06:22 PM
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#30
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Senior Member
Join Date: Nov 2005
Posts: 4,063
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Quote:
Originally Posted by LETMGROW
If it was a GM trans. it would be a 4L80E which is also electronic and doesn't have a vacuum modulator.
I was thinking the P 32 went to an Allison 5 speed in 2003 but I could be mistaken.
To try to help the OP I would suggest removing the spark plugs on the bank which is showing the gray smoke and check the plugs for discoloration or signs of anti freeze. If nothing is found the cooling system should be pressure tested with the plugs still out and looking for signs of coolant. With pressure applied you can turn the engine over with the starter (ignition or injectors disabled) and if there is a coolant leak into a cylinder coolant will be forced out of a spark plug hole or holes.
I'm leaning toward a cracked cylinder head or a bad head gasket.
There are also test kits available which will test coolant for presence of combustion particles. Not terribly expensive. I bought mine at my local NAPA store.
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Pulling the spark plugs is a great place to start and will give you a very good indication if there is oil or coolant getting into the cylinders. You could also hook it up to an OBD reader and see what the fuel trims on that bank indicate to see if the computer is trying to compensate for high temperatures, misfire, etc. Checking the dipstick can also tell you alot as it can have a soapy residue on it if the head gasket is leaking coolant or can have a stale gasoline smell if the fuel injectors are leaking down and diluting things at shutdown which will eventually cause excess wear and blowby on the cylinders impacted.
It could be something as simple as a weak spark plug or spark plug wire or COP unit depending on how the engine is configured causing it to misfire when under a heavy load.
A blue tooth ODB reader is pretty inexpensive and even the free software for them will allow most smartphones or tablets to diagnose the problem without having to drop many hundreds on a full automotive diagnostic computer.
I use one similar to this highly rated $20 model which works with all my Android devices, though not this exact one.
https://www.amazon.com/BAFX-Products...%2C222&sr=8-29
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Neil V
2001 Winnebago Adventurer WFG35U
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10-10-2021, 06:32 PM
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#32
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Junior Member
Join Date: Apr 2017
Posts: 10
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Quote:
Originally Posted by oliverquibbl
What is the fix in a gas motorhome that has gray smoke coming out of one exhaust only on acceleration?
It's a 2006 8100 Vortex GM engine on Workhorse Chassie.
Mileage 73k.
Before I take it to a shop, I'd like to hear suggestions from this group rather relying solely on a repair shop.
Quote ReplyReport •••
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Check your oil fill cap see if has some white residue on it . If it does start with the simple stuff. Has your RV been sitting for a while . Have you been driving slow . If you don't hear any knocking run it faster than a normal slow rpms . You might just have to get the condisation out of it . Change your oil see if there is water in it .also condisation will build up in the exhaust. If your rpm revs up and down at idle you probably have a head gasket problem .also the thermastat will fluctuate severely. If your gages are steady you could have just a pvc valve clogged and the engine is not breathing normal
.your lucky it is a chevy engine . Any one can work on them and parts are mostly reasonable
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10-10-2021, 06:49 PM
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#33
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Senior Member
Join Date: Nov 2005
Posts: 4,063
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The exact fit parts for the 2006 W22 and W24 is a set of 8 COP units however I am not inclined to be too dogmatic about how the OP's engine is set up since we do not have an eye on it or a good photo of the engine as there can always be an exception to the rule.
This is what the set for the 2006 W22 looks like:
Here is the W22 Crankshaft Position Sensor Plug:
The listing indicates that these were used from 1999 to 2009. You need to check the specific vehicle to verify as there may be differences depending on whether the VIN Number has the G-L18 designation or not.
On the 2006 with the G-L18 designation it could be a spark plug, individual coil or one of the 8 position sensor plugs causing a misfire or a computer related issue.
With only 78,000 miles its less likely to be a bad cylinder unless from lack of use the piston rings could be a bit sticky however there are products that can be used to free those up before any permanent damage is done.
See: https://shop.advanceautoparts.com/p/...923%7CL2*15034
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Neil V
2001 Winnebago Adventurer WFG35U
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10-10-2021, 09:07 PM
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#34
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Senior Member
Join Date: Jun 2016
Location: SW Louisiana
Posts: 8,925
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Quote:
Originally Posted by DryCreek
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The 8.1L does not have a distributor, it uses Coil Near Plug ignition, you will note that all spark plug wires are the same length for the 8.1L as they run from the spark plug to the coil pack mounted near each cylinder.
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2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar 420Ah LiFePo4
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates
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10-10-2021, 09:10 PM
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#35
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Senior Member
Join Date: Mar 2019
Posts: 964
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White smoke; Take off your oil fill cap on the engine, look under the cap. If it’s a light foamy chocolate milk looking substance, then yes, coolant is mixing with oil. Could be head gasket or warped head.
If it’s a blue tint then your burning oil. Possible causes are warn valve/seals, oil ring worn on piston.
Just a guess without seeing it.
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10-10-2021, 09:52 PM
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#36
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: May 2016
Location: Kamloops, BC, 60 miles from the Center of the Universe according to the Rinpoche, of the SF monks.
Posts: 7,385
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Quote:
Originally Posted by oliverquibbl
Let me update my wife's original description of the problem. First it is black smoke, and only upon acceleration. After that, the black smoke clears and it is normal exhaust. And it is only on the driver's side exhaust pipe. The passenger side exhaust pipe is normal. Here is another tidbit of information: Sometimes when the engine is idling at a stoplight or something like that, the engine runs kind of rough. It is an intermittent problem. Sometimes it idles smoothly at stop lights, other times it does not. A long time ago, I had this rough idling problem that got worse over time. After a while, the engine bucked and heaved a bit under load. It turns out, it was missing on one of the cylinders. They replaced all spark plugs and wires back then, and the engine had run problem free since then, until now. But back then, I didn't notice if black smoke came out of the exhaust upon acceleration. I only know about it this time because my wife followed me in the car for a short trip (instead of pulling the car as a toad). She noticed the black smoke issue. So I'm leaning towards a cylinder issue rather than a blown head gasket. But I'm no expert.
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If it's running smooth, pulling hard and has no obvious contamination in the oil or coolant, keep on cruising.
Watch your fuel mileage and if it gets bad, you may have some injectors going bad.
Most likely it's the evap system dumping fuel vapors into the engine.
The 8.1 did use a fuel pressure regulator mounted on the top of the engine for a few years, but I think you have yours in the tank. I could be wrong there though. The regulator on top of the engine can leak fuel into the intake.
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Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!
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10-10-2021, 11:10 PM
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#37
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Senior Member
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 6,517
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Quote:
Originally Posted by DryCreek
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Those happen to be spark plug wires. They connect between the ignition coils (8) and the 8 spark plugs. This is not a "coil on plug" design ignition system. The coils are mounted individually on the rocker covers. There is no distributor or rotor on an 8.1 engine.
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2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
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10-11-2021, 09:27 AM
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#38
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Junior Member
Join Date: May 2021
Location: Big Rapids, mi.
Posts: 12
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Quote:
Originally Posted by oliverquibbl
What is the fix in a gas motorhome that has gray smoke coming out of one exhaust only on acceleration?
It's a 2006 8100 Vortex GM engine on Workhorse Chassie.
Mileage 73k.
Before I take it to a shop, I'd like to hear suggestions from this group rather relying solely on a repair shop.
Quote ReplyReport •••
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I was an GM TECH for many years specializing in engines and transmissions. One of the first things that I would want to check would be the spark plugs. Pull all 4 on the bank in question. 1 of them would probably look different from the rest. If one is carboned up would make me think oil usage, or if one is very clean would make me think probably an antifreeze leak. More than likely it will be one of the other . Or also could be an I take gasket allowing oil to get sucked in.
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10-11-2021, 04:53 PM
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#39
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Senior Member
Join Date: Feb 2015
Location: Grapevine, Tx
Posts: 5,632
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Quote:
Originally Posted by Johnynorthla
White smoke; Take off your oil fill cap on the engine, look under the cap. If it’s a light foamy chocolate milk looking substance, then yes, coolant is mixing with oil. Could be head gasket or warped head.
If it’s a blue tint then your burning oil. Possible causes are warn valve/seals, oil ring worn on piston.
Just a guess without seeing it.
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He said it's black smoke...
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2004 Fleetwood Southwind 32VS W20 - SOLD!
ReadyBrute Elite towing a 2017 Ford Edge Sport
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10-11-2021, 05:20 PM
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#40
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Member
Join Date: Jul 2021
Location: Needville Tx
Posts: 66
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Black smoke is fuel. Blue smoke is oil, white smoke is water.
Considering Black smoke one side and slight miss sometimes, one cylinder on the side with the black soot is missfiring. Should have a code set, but if not, pull plugs on that side and see if one looks blackish. Change that coil, wire, and plug and retry.
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10-11-2021, 06:51 PM
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#41
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Registered User
Join Date: May 2017
Posts: 1,116
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Quote:
Originally Posted by Isaac-1
The 8.1L does not have a distributor, it uses Coil Near Plug ignition, you will note that all spark plug wires are the same length for the 8.1L as they run from the spark plug to the coil pack mounted near each cylinder.
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I helped a friend change his wires on a C3500 once. I do remember the coil packs, but instead of eight I remember two with four leads each, wasted-spark design. It has been years though. The OEM wires were brittle and "leaky".
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