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Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > 1991 P30 454 intermittent surging, power loss

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vacuumbed

Salt Lake City, Utah

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Posted: 08/17/22 03:27am Link  |  Quote  |  Print  |  Notify Moderator

Hi everyone,
I just bought this 91 Damon Challenger P30 454 TBI and it has this intermittent issue at slower speeds. It doesn't do it all the time.

It idles fine, has trouble accelerating, power loss, massive engine speed surging while driving, and an occasional backfire through the intake. If I shut the engine down for 10 minutes, it may run perfectly fine. Air filter looks new, and both injectors are spraying.

Strange issue, I am stumped. Please help.

Bruce Brown

Northern NY

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Posted: 08/17/22 05:18am Link  |  Quote  |  Print  |  Notify Moderator

I'd start with a new fuel filter. If that doesn't do it next up would be the fuel pump.

I'm not well versed on the vintage Chevy so it may have an in-tank pump with the filter attached.

If it does, I'd replace them both at the same time.

What you're describing is exactly what our '90 Ford chassis did and the above fixed ours. Adding a Banks kit didn't hurt either. We used the smaller kit, the one that kept the factory manifolds.


There are 24 hours in every day - it all depends on how you choose to use them.
Bruce & Jill Brown
2008 Kountry Star Pusher 3910


enblethen

Moses Lake, WA

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Posted: 08/17/22 07:47am Link  |  Quote  |  Print  |  Notify Moderator

Fuel pump is in the tank. Hard to find assembly which includes fuel gauge sending unit.
Fuel filter is located on the right-side frame rail in front of the rear tires.
Fuel filter would be first thing to change.
1/2 in socket with about six in extension to loosen bracket.
Be prepared for fuel pressure to be release once lines are disconnected. About a cup is normal.


Bud
USAF Retired
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wildmanbaker

Kennewick, Washington

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Posted: 08/17/22 08:45am Link  |  Quote  |  Print  |  Notify Moderator

This really sounds like a secondary electrical problem. Either plugs or wires, could also be the coil or connections in that area.
Good luck.


Wildmanbaker


IB853347201

Eastern Ontario

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Posted: 08/17/22 08:51am Link  |  Quote  |  Print  |  Notify Moderator

Is the check engine light on, if so I'd borrow a code reader and start there.
If not, new plugs and wires would be on my list first.


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BluegrassBill

Woodland, Wa. USA

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Posted: 08/17/22 09:24am Link  |  Quote  |  Print  |  Notify Moderator

Enblethen really knows these Chevy 454 RV's. Do the filter, Then if not fixed have fuel pump pressure checked. Shop's charge over $1000. to do new pump. Ask me how I know [emoticon] I had a full tank and was leary of wrenches and metal sparks around gasoline). You can check fuel pressure by unhooking fuel-in line to TBI turning on key, Should be a very strong spurt/flow Use container to catch fuel.
These are JMHO having had this 95 since 2002, Still running and driving great.


Bill & Kathy Francis
95 Itasca Sunrise 29RQ,P32 454 Chevy, Banks,ECM chip.Safe-T-Plus, Bilsteins, Super Steer Bell Crank, Stewart Stage 1 Waterpump, Severe Duty Fan Clutch, OilGuard Bypass Filter, Coolant Filter. Rear Tracbar. 1-5/8" Front Swaybar.


Gjac

Milford, CT

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Posted: 08/17/22 09:44am Link  |  Quote  |  Print  |  Notify Moderator

It could be a fuel problem or ignition problem. To further narrow down your issue I would wait until dark remove the doghouse and start the engine. If you see arching from the ignition wires to the engine block that is where you are losing power. The 454 generates a lot of heat especially if your exhaust manifolds are leaking and can ruin ignition wires fairly quickly. Do you hear a ticking sound at idle coming from the exhaust manifolds? I have had both fuel and ignition problems causing your symptoms one was wires the other a failing fuel pump.

Gjac

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Posted: 08/17/22 09:49am Link  |  Quote  |  Print  |  Notify Moderator

IB853347201 wrote:

Is the check engine light on, if so I'd borrow a code reader and start there.
If not, new plugs and wires would be on my list first.
No code reader for an OBD1 system which he has on a 91 454. Just generic codes by shorting two wires in the ODD1 connector and counting flashes.

vacuumbed

Salt Lake City, Utah

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Posted: 08/17/22 10:00am Link  |  Quote  |  Print  |  Notify Moderator

Good morning everyone, the fuel filter is a great idea. I am going to do that first today, and I will report back with the results. Thank you for your replies. [emoticon]

vacuumbed

Salt Lake City, Utah

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Posted: 08/17/22 10:04am Link  |  Quote  |  Print  |  Notify Moderator

IB853347201 wrote:

Is the check engine light on, if so I'd borrow a code reader and start there.
If not, new plugs and wires would be on my list first.


No CEL, it does come on when the engine is started and then it turns off. So it is operational.

I saw the plug wires last night, they appeared to look fine. I will look at them again today, and see if there's any warning signs of wear or arcing.

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