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09-30-2022, 02:22 PM
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#1
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Member
Join Date: Feb 2014
Location: Sacramento, CA
Posts: 44
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Hard starting 01 8.1
My 2001 8.1 all of a sudden became very hard to start. Have to crank several times before it fires. Put a pressure gauge on schrader valve on fuel rail. Turning on key pressure goes to 58 then dops to 46. Engaging starter it drops to 42 If engine starts it goes to a flikering 47. After shutting engine off it goe to 36 and stays. Just for drill i replace fuel pressure regulator. No change. No engine warning lites. No scan guage errors. What should i be looking at?
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09-30-2022, 02:34 PM
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#2
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Senior Member
Monaco Owners Club
Join Date: Oct 2009
Location: Tucson, AZ
Posts: 6,579
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Any codes set?
I assume it's cranking over full speed?
First change the fuel filter. Then you may have to check the "sock" attached to the in tank fuel pump pickup. I would also install a new pump at that time.
How old are the spark plugs?
__________________
97 Monaco Windsor- Sold
07 Monaco Executive McKinley- Sold
04 Monaco Signature Chateau IV
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09-30-2022, 02:50 PM
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#3
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Jun 2016
Location: On the continental divide
Posts: 2,622
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I had the same issue with our '04 Pace Arrow 8.1 while on our first trip out.
Turned out to be the back flow pressure regulator in the fuel pump.
We had 36 -42 pressure on the rail up front, and that was good enough for an idle, but she would not pull a load. You need 65# at the rail to run down the road.
Unfortunately the pump is in the tank, which you will have to drop. No big deal with a floor jack and a section of 2 x 8 lumber. It's only 8 nuts.
I got my pump from Brazel's RV. They are really nice folks.
Mike in Colorado
__________________
2004 Fleetwood Pace Arrow 37c, 8.1 gasser, (Jezebel) Ultra RV ECM / TCM, plugs wires, and rear track bar, PPE deep Tx pan w/ temp gage, Bilstein's, Sailun's & Sumo's all round, pushed by a 2002 Grand Caravan, on a Master Tow Dolly OR a WR-250 on a rail.
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10-01-2022, 08:50 AM
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#4
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Member
Join Date: Feb 2014
Location: Sacramento, CA
Posts: 44
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There are no error codes. I don't think it is a spark plug, fuel pump issue, or dirty filter. Once it fires it runs great. Recently I drove up a long steep grade which would have really tested the fuel pump and the plugs, and it did just fine. My sense is that it is an ignition problem, but where, I don't know.
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10-01-2022, 09:42 AM
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#5
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Senior Member
Official iRV2 Sponsor
Join Date: Jul 2005
Location: CENTRALIA, WA
Posts: 1,526
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Fuel pressure is a little low and it should not bleed off quickly. I would say based on the symptoms it’s either that or the crankshaft position sensor, they are a known issue on the early 8.1L’s.
__________________
Jon Brazel
Ultra RV Products / Brazel's RV Performance
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10-01-2022, 10:12 AM
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#6
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Member
Join Date: Feb 2014
Location: Sacramento, CA
Posts: 44
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Quote:
Originally Posted by Ultra RV Products
Fuel pressure is a little low and it should not bleed off quickly. I would say based on the symptoms it’s either that or the crankshaft position sensor, they are a known issue on the early 8.1L’s.
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When you say "it's either that" are you referring to the fuel pump. Are you suggesting that might need replacing? Also, would a failure in the crankshaft position sensor show up as an error code on the Scan Gauge?
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10-03-2022, 01:25 AM
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#7
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Senior Member
Join Date: Apr 2022
Location: Renton-Highlands,Wa./HB,Ca./Fujieda-Japan
Posts: 832
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A bad coolant temp sensor can also cause this. Front side of intake manifold.
__________________
1994 Southwind Storm 28ft - 454TBI w/4L80E
VIN#1GBJP37N4R3314754
Flight System G-Man 360 generator man (PM me)
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10-03-2022, 08:17 AM
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#8
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Member
Join Date: Feb 2014
Location: Sacramento, CA
Posts: 44
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Quote:
Originally Posted by 1972VWbus
A bad coolant temp sensor can also cause this. Front side of intake manifold.
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Would this show on an OBD2 code?
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10-03-2022, 08:49 PM
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#9
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Senior Member
Join Date: Apr 2022
Location: Renton-Highlands,Wa./HB,Ca./Fujieda-Japan
Posts: 832
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Quote:
Originally Posted by ntinling
Would this show on an OBD2 code?
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it certainly will if the sensor is not working correctly.
When the engine is cold what does it read?
When at operating temp what does it read?
__________________
1994 Southwind Storm 28ft - 454TBI w/4L80E
VIN#1GBJP37N4R3314754
Flight System G-Man 360 generator man (PM me)
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10-03-2022, 08:51 PM
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#10
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Senior Member
Join Date: Apr 2022
Location: Renton-Highlands,Wa./HB,Ca./Fujieda-Japan
Posts: 832
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Quote:
Originally Posted by ntinling
Would this show on an OBD2 code?
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That depends. Sometimes it takes awhile before a code will flag and set the light off.
__________________
1994 Southwind Storm 28ft - 454TBI w/4L80E
VIN#1GBJP37N4R3314754
Flight System G-Man 360 generator man (PM me)
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10-04-2022, 09:00 AM
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#11
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Member
Join Date: Feb 2014
Location: Sacramento, CA
Posts: 44
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Quote:
Originally Posted by Ultra RV Products
Fuel pressure is a little low and it should not bleed off quickly. I would say based on the symptoms it’s either that or the crankshaft position sensor, they are a known issue on the early 8.1L’s.
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Well, I'm stumped, so I am taking it in for service. I will post the results when I get it back from the shop.
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10-04-2022, 09:33 AM
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#12
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Jun 2016
Location: On the continental divide
Posts: 2,622
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Quote:
Originally Posted by ntinling
Well, I'm stumped, so I am taking it in for service. I will post the results when I get it back from the shop.
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Re read post #3.
Especially the part about needing 65# to make her run down the road !
Mike in Colorado
__________________
2004 Fleetwood Pace Arrow 37c, 8.1 gasser, (Jezebel) Ultra RV ECM / TCM, plugs wires, and rear track bar, PPE deep Tx pan w/ temp gage, Bilstein's, Sailun's & Sumo's all round, pushed by a 2002 Grand Caravan, on a Master Tow Dolly OR a WR-250 on a rail.
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10-05-2022, 09:36 AM
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#13
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Member
Join Date: Feb 2014
Location: Sacramento, CA
Posts: 44
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Quote:
Originally Posted by Flyer15015
Re read post #3.
Especially the part about needing 65# to make her run down the road !
Mike in Colorado
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As I stated earlier, it ran down the road just fine, including pulling a long steep grade, mpg reading of 3, so a big fuel use for a long time.
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10-05-2022, 10:39 AM
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#14
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Senior Member
Join Date: Apr 2022
Location: Renton-Highlands,Wa./HB,Ca./Fujieda-Japan
Posts: 832
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Any word back?
__________________
1994 Southwind Storm 28ft - 454TBI w/4L80E
VIN#1GBJP37N4R3314754
Flight System G-Man 360 generator man (PM me)
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