Question about 1984 Cadillac DeVille

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84 DeVille Limo bad running

I have an 84 DeVille Limo that is having some serious issues. 1. engine runs as if misfiring - replaced plugs/wires/cap/rotor (have not checked for vacuum leak yet) 2. idle is high - have replaced MAF sensor/idle control valve/ECU 3. occasionally when I hit the gas the car lags/bogs down and feels as if it is going to stop/stall/die 4. while driving, when trying to accelerate into passing gear on the highway or going up hill upon acceleration the car will either shift very hard into passing gear and/or rev up and sound like I am pushing the car beyond it's limits and either hold speed or start to drop in speed regardless of how hard I hit the gas - I recently had the transmission fluid and oil changed which did not help 5. last one... yesterday my heater started rattling/vibrating/clunking even on low - I have a feeling the heater core/motor needs to be replaced but not sure where it is located Can anyone help with any of these problems?

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  • customaddres
    customaddres Jan 22, 2013

    thank you folks I will be bringing up all of these things when I go see my other mechanic on Thursday

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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3mac
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SOURCE: 95 sedan deville wont start and says fuel low with gas in tank

I'd start by tracing the fuel supply and return lines from the gas tank to the engine compartment. Make sure that they are free of kinks or other damage.

Next, check the fuse box and make sure there is power to the fuel pump. Trace the electrical connections leaving the fuel tank and make sure they weren't torn or otherwise damaged by the tire tread.

Hope this helps and good luck!

Posted on Jan 13, 2009

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wyatt1582
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SOURCE: engine hesitates or cuts out with a forward load but not ireverse

Check fuel pressure at idle it should read 30psi. If you have a weak fuel pump it will act just like you describe. Located intake and replace the fuel filter.

Posted on Apr 22, 2009

ftw1952
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SOURCE: Stalling Issues

Was the TPS adjusted to 1.5 volts or checked for that voltage reading beforehand?

Posted on May 30, 2009

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SOURCE: 1991 cadillac deville fwd 4.9 engine shudders hard

I have a 1991 Cadillac Fleetwood 4.9 120000 miles, I have the same problem. replaced plugs,wires,cleaned throttle body, and O2 sensor and have same problem. Taking it to a GM shop on 02/24/10.

Posted on Feb 23, 2010

noranda21
  • 1547 Answers

SOURCE: car starts rough idles very low almost dies while

your vacum leaks has alot to do with it have vacum leaks fixed auto parts store sells the correct size hose you need at a ver fair price fix vacum leaks first then see how it runs after thatcheck fluid level in transmission and change transmission filter

Posted on Dec 23, 2010

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