Hey guys,

I've got an intermittent problem here....

On my '98 Regal 3.8, I've got an intermittent stumble at normal acceleration, only when the car is partially warmed up (at the 1/4 mark range on the temp gauge). It never occurs when started from cold, or when fully warmed up. When it does happen, the car coughs a few times under acceleration, for probably a city block or two, then goes away as it warms up. If I stop while it is acting up, I get a rough idle. It's set a check engine light, which bounces between P0401 Insufficient Flow EGR and P0171 Fuel System Too Lean Bank 1. I can reset the code, and even with no symptoms, from a cold start, the SES light will come back on in a few blocks, and will alternate between those two.

I'm guessing I've got a bad/clogged EGR valve, as it only acts up based on engine temperature (halfway warmed up). Am I on the right track? A buddy at work picked me up a good used EGR off of another Series II 3800 to try out. Are all Series II EGR's interchangeable? Are there any other things I should check for, or should I try cleaning either of these EGR's (if so, what is the best way to do that)?

(Btw, the car only has 133k and was a 1-owner car prior to me buying it - I only drive it 2 miles to work, so it's likely seen a lot of short trips in its life - likely to have carbon issues).

_________________
~Ben


2010 Chrysler 300 Touring Signature Series, Cool Vanilla - chrome 18's, MyGig touchsreen, all the toys.
2004 Chevy Avalanche LT 4x4, WBH, Arrival Blue Metallic - CAI, MBRP cat-back exhaust, lots of mods and all the options.
2004 Ford Mustang Premium convertible, Screaming Yellow - 18" staggered Bullitt wheels, 1.5" drop Eibach springs, CAI.
1973 Cadillac Fleetwood Series 60 Brougham, Antigua Blue - 23 ft, 5200 lbs, and 472 cubes of luxo-barge goodness.
1998 Chevy Corvette convertible, Light Carmine Red Metallic

*crickets* ....

_________________
~Ben


2010 Chrysler 300 Touring Signature Series, Cool Vanilla - chrome 18's, MyGig touchsreen, all the toys.
2004 Chevy Avalanche LT 4x4, WBH, Arrival Blue Metallic - CAI, MBRP cat-back exhaust, lots of mods and all the options.
2004 Ford Mustang Premium convertible, Screaming Yellow - 18" staggered Bullitt wheels, 1.5" drop Eibach springs, CAI.
1973 Cadillac Fleetwood Series 60 Brougham, Antigua Blue - 23 ft, 5200 lbs, and 472 cubes of luxo-barge goodness.
1998 Chevy Corvette convertible, Light Carmine Red Metallic

EGR should be interchangeable among 3800's. As long as the connector is the same and it's not off a 60* v6.

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2009 Chevy Silverado 2500HD crew cab, 6.0, Z71. The project mover.
2002 Regal GS: 3.4 pulley, E85, and quicker than my old 99
1982 Pontiac Grand Prix L67, T56, GT45, T56, Holley EFI; It's pretty quick Mod list here

Also check the tubes for cracks.

_________________
Andrew - owner/operator of Bonnevilles Unlimited

2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
1997 Corvette | 55k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
2014 Town & Country Limited | Cashmere Pearl | 95k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 260k | Official Bonneville Hauler

Replaced the EGR with a good used one out of a good running '99 Grand Prix with under 100k, and a coworker had a spare screened gasket. I'm still getting the same symptoms and codes coming back. I forgot to check the tubes - should that be my next step? What else should I look for?

_________________
~Ben


2010 Chrysler 300 Touring Signature Series, Cool Vanilla - chrome 18's, MyGig touchsreen, all the toys.
2004 Chevy Avalanche LT 4x4, WBH, Arrival Blue Metallic - CAI, MBRP cat-back exhaust, lots of mods and all the options.
2004 Ford Mustang Premium convertible, Screaming Yellow - 18" staggered Bullitt wheels, 1.5" drop Eibach springs, CAI.
1973 Cadillac Fleetwood Series 60 Brougham, Antigua Blue - 23 ft, 5200 lbs, and 472 cubes of luxo-barge goodness.
1998 Chevy Corvette convertible, Light Carmine Red Metallic