My MX-6 would not start the other day. First thing is when i leave the car sitting 4 a couple of days without starting it the car would need a jump. Yesterday around 4pm i turned the key, the car started but died..tried again it started then died but it remains running as long as i am giving it gas and when i get to a stop sign it dies unless i put it on neutral and give it gas at the same time.
This morning it was cold, it started and 5 minutes later it shut off, i looked at the rpm, it was below the norm. I noticed the needle dropping then moving up a bit as if i have a vaccum leak.
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Re: 94 MX-6 Starting issue
You may have a fuel pump issue or pressure relief problem Try squeezing the fuel return line/hose with the appropriate tool so you dont damage the hose and see if thiers any improvement as it could be bypassing back to the fuel tank.Also are the air box /air filter and associated inlet tubes tight with no leaks or splits.If the inlet system is leaking it upsets the air flow meter and acts like a vacuum leak.you are right as it could also be a vacuum leak
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new cars have a lot of things running in the back ground, you can hook and AMP meter on the battery and see how much it pulls just sitting there, then one by one unplug fuses and see if maybe a relay has welded its self closed and drawing more current then it should in the off postion. if possible hook a battery tender to your car and plug it in, it will keep a small amount of current going to the battery and should keep the battery charged.
You should've changed the coil when you replaced the starter. If you could only do one at a time, I would've gone with the coil first. There is a brass plate that gets charred with carbon build up. Your banging on the coil shakes some of it off, re-establishing a good connection. You can sometimes get away with taking it apart and cleaning all off with a mini-grinder or rotary wire brush. This will confirm it for you and buy you time until payday or your next day off.
you have a egr system problem, most likely an oxy sensor. also check the intake sensors as they will corrode easily when let set without starting for awhile, this is why any mechanic will tell you to start a car daily and let it idle for a few minutes. (if it is a daily driver in your position)
About the only thing within time that can change from sitting that would effect starting performance is the fuel. The fuel is probably evaporating from your lines and other areas of the system. Try turning the key to start with a pause till you hear the fuel pump stop, THEN turn it to run.
It sounds like your battery isn't holding a charge. Regarding the starting, you may have to replace your starter solenoid. Although many cars do not start if the brake pedal is not depressed, the thunderbird is not one of them. I have one outside in my driveway right now. There are unfortunately, numerous electrical glitches with 89-94 Thunderbirds. I have replaced many many electrical parts for both of mine (a '90 v-6 and a '94 v-8)
replace your battery, a battery discharges every day you dont run the alt. to charge it up... after a week or 2 weeks the battery would be dead, just from a car sitting not being started... if you are not using the vehicle, it is a good thing to replace the battery, and every couple days just start the car up and let it run a while to charge the battery.... if you are going to have to leave the car for a while without starting it, then disconnect the battery, and remove it from the vehicle... you can buy a cheap trickel charger for the battery when it is out that will keep it charged till you decide to put it back in.... hope this helps you...