tsjm777 Posted November 4, 2011 Report Share Posted November 4, 2011 97 STS was doing thermagasket repair and then car started running poorly with no power at all, thermagasket was starting to seal it up too! So, was getting code 1108 Baro to Map Sensor to high, replaced Map Sensor with no difference. Gauged fuel pressure was 35 to 40, replaced Fuel Pressure Regulator, now 40 to 45. Starts and idles rough, but when gas pedal is hit, bogs down bad and kills most of the time. Fuel pump? Pulled air intake to Mass Air Flow Sensor, was some moisture in there like water drops in housing, filament on Sensor looked corroded but hard to tell, blew it off to dry and put back together with no apparent air leaks, ran the same. Any ideas?? Thanks ahead of time! Tom Link to comment Share on other sites More sharing options...
Ranger Posted November 5, 2011 Report Share Posted November 5, 2011 but when gas pedal is hit, bogs down bad and kills most of the time. Fuel pump? Sounds like a bad fuel pump. What does the fuel pressure do when you hit the gas? That said, I would not put any money into it unless you plan on replacing the HG's and doing the inserts. Thermagasket is a temporary fix at best. It will not last. Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 5, 2011 Report Share Posted November 5, 2011 Maybe thermagasket was sucked into a couple of cylinders and solidified Your fuel pressures sound perfect Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
tsjm777 Posted November 5, 2011 Author Report Share Posted November 5, 2011 Thanks for replys. Fuel pressure drops a little when gas pedal is pushed, pressure gauge needle is pretty jerky, drops to 40 to 42 when pushed, at idle is around 45 after it builds up. I don't plan on keeping it, so that's why I'm doing thermagasket. Tom Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 5, 2011 Report Share Posted November 5, 2011 Fuel pressure sounds good Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
mike5514 Posted November 7, 2011 Report Share Posted November 7, 2011 You might try fuel filter Fairly cheap and easy.Mike Link to comment Share on other sites More sharing options...
KHE Posted November 7, 2011 Report Share Posted November 7, 2011 Thanks for replys. Fuel pressure drops a little when gas pedal is pushed, pressure gauge needle is pretty jerky, drops to 40 to 42 when pushed, at idle is around 45 after it builds up. I don't plan on keeping it, so that's why I'm doing thermagasket. Tom You need to observe the fuel pressure while driving the car. I hope you disclose the "thermagasket" to a prospective buyer.... Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
scott y Posted November 8, 2011 Report Share Posted November 8, 2011 Yeah, that'd be NICE! Link to comment Share on other sites More sharing options...
Ranger Posted November 8, 2011 Report Share Posted November 8, 2011 "I pity the fool" (who buys it). Link to comment Share on other sites More sharing options...
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