adallak

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adallak last won the day on July 11

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About adallak

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    CaddyInfo Enthusiast
  • Birthday 01/31/1959

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  • Gender
    Male
  • Location
    MA

Previous Fields

  • Car Model and Year
    1995 Fleetwood Brougham 123.XXX miles
  • Engine
    5.7L OHV V8

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  1. I recall my 4.9 having a very big crack on exhaust manifold right behind radiator. Now, I think it could be the reason for rough idle. But I never had a poor fuel economy. I think I might have an exhaust leak (invisible crack, bad gasket, etc.) which affects fuel economy so dramatically. I can go ahead and replace the passenger side exhaust manifold, gaskets, etc. But, even replacing oxygen sensors was not a fun work at all on this old girl, that's what makes me a bit reluctant...
  2. Yes I have replaced (perfectly good) plugs. And I check them often. They look good. Spark wires are new as well.
  3. Yes, cracked exhaust manifold is a possibility, but you will not know until you actually take it off... Another PITA job, just like removing oxygen sensors was. And chances are it will do nothing ,just like replacing oxygen sensors did.
  4. Thank you, Mike. Sure, two heads are better than one, especially when the second head is yours! I sent you a message.
  5. Thank you , Mike. I sent you a message. I know you will not let me sit and wait till things get better by themselves! LOL
  6. Yes, Mike... I am sure I have covered almost everything... well, some day the cause will expose itself, I hope so anyway. Thanks for trying to help me!
  7. Funny, the reply in that thread comes from me (HUF). I do not think I have any leaky injectors, otherwise the fuel pressure would not hold for some 30 minutes when I prime the system. Right? No black smoke, no fuel smell in exhaust either.
  8. Mike, ALL the subjects you brought up were addressed except for exhaust restriction. Most of replaced parts are ACDelco. As I said, this car never had a code. Climate control shows any trouble code if you know how to get them, so I check everything now and then. No check engine light ever. I also know that a sensor can be bad and it will take a while to show a code, so I have replaced a lot of things "just in case". I have the FSM, of course. The vacuum is around 20" Hg depending on a location. It is a bit low, but that's all I have got. Optispark is vented and it works perfectly. Coil, wires, plugs are new and fine. Fuel trims would be probably helpful, but I am tired spending more $$$ on this old girl. I am trying to find a success story from someone fixing the problem just like this thread shows.
  9. LT1 takes regular. No, it is OBD 1. Unfortunately, there are so many things , which could affect fuel economy (or intermittent lack of power) and finding them is a PITA if you do not have proper diagnostics tools. I have heard too many stories how people would take the car to a dealer and after spending $$$$$$ they would just sell the car. I do not want o go that rout.
  10. No power-train related codes whatsoever and I never had one... There were always driveabilty issues such as sudden lack of power, hesitation, etc, but fuel economy was decent for many years. I have noticed dramatic drop two years ago. Again, I have replaced every part , which could be responsible. Just wasted money and time, I guess. 10 MPG around the town is just way too much. or should I say too less.
  11. Mike, I just did what you suggested. No fuel coming from the nipple. I am wondering what revving does to FPR if the vacuum line is taken off. There are FPR tests in the manual suggesting kinking return fuel line, etc, but I am a bit reluctant touching 23 years old hoses. Something tells me the FPR is fine. When I compare this LT1 with 123,000 miles to 4.9 with 175,000 in my 1991 Seville, this engine is so much cleaner and nicer, yet I never experienced lack of power, driveability problems, and terrible fuel economy with my Seville. This engine must have been tuned so that it is just too sensitive to possible exhaust, vacuum leaks, ignition, etc.
  12. I have connected a transparent PVC tube to the FPR and sucked the air providing around the same 20"Hg vacuum. There was vapor and there was no gasoline in the tube whatsoever. I think nothing is wrong with FPR. No symptoms of a bad FPR either.
  13. Rejuvenating an old thread. For the last two years, the fuel economy of my 1995 Fleetwood with 123,000 miles on the clock has been 10 MPG around the town. It is 17-22 MPG on a long highway trip. Unfortunately, 90% of my driving is around the town. I have done all the usual checks, which has been pretty much throwing parts at the problem. Still there. New O2 sensors, new exhaust manifold bolts, fuel filter, fuel pump, FPR is fine, injectors are not leaking, fuel pressure within specs, no visible vacuum leaks. I do smell exhaust under the hood but cannot find it. MAF is clean, IAT sensor shows 3.62K at +72F, engine coolant sensor is fine, no powertrain-related codes. EGR valve is new. Ignition is fine, no misses. This is super frustrating and costly. There are some driveability issues (lack of power now and then), but this car had them since the day one and they are not really fuel mileage -related. Transmission lock-up is fine, brakes are fine, tire pressure is fine. It is OBD1 and diagnostics tools are expensive and I am not sure they would help either. Just venting out my frustration and the pain at the pump! Took off the vacuum line and there IS a very, very faint smell of gas. No gas in the line or dripping from nipple of FPR. I just cannot see how that amount of gas vapor could mess things up. Obviously, there is no fuel loss through that vacuum line at all.
  14. adallak

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