Looseing power
Asked by Tbirdguy Jan 22, 2017 at 09:17 PM about the 1991 Ford Thunderbird RWD
Question type: Maintenance & Repair
Ive got a 1991 ford t bird 3.8
motorit has 20,000 miles onitbeen
parked sence 92 i put new plugs
wires tank blew feul lines out ran
fine for 400 miles now it will start
fine but once u give it some gas
falls on its face let off the gas
idals fine agian
3 Answers
Sounds like a dirty throttle body or sensor, try cleaning the mass air flow sensor or replacing it, also the EGR and DPFE sensor, pay attention to the rubber tubes to/from it, they can clog up with carbon. Cars been sitting for over 2 decades, every vacuum hose is now suspect. Some sea foam also wouldn't hurt, to clean things out.
Ken nailed it- the skunky gas probably gunked up the fuel injection. Blowing out the lines was only part of what it needed. Probably not delivering the fuel volume it needs. Check for pressure drop when you come off idle. Also, make sure spark isn't weak.
Have you checked the cyl compression? Sitting that long you may have frozen rings which is giving you low compression. The engine can run but will not get power to continue. Just an idea.
