It sounds like a weak fuel pump. When you stated that the car with start off ether. Did you mean that it would start and stall or that it would stay running. If it starts and then dies you will need to look at a lot more components. Including: (The fuel filter, fuel pump, fuel pump relay, fuel injectors, fuel pressure regulator, oil sending unit, Cam sensor, ignition module, or coil) Your engine needs fuel and spark to run, check to see if you have both. Please write back with any findings or questions. Be as specific as you can. Good luck.
SOURCE: no start
if it runs on starting fluid its a fuel problem.. check fuel pressure even if its a couple of pounds off, the vehicle will not run. but using starting fluid may give you the extra poundage you need to make it run . also check vacuum hose at pressure regulator on fuel rail
SOURCE: 1991 Buick Regal will not start
Chech to see if you're gettin a signal from the crankshaft position sensor located behind the crank pulley. If no signal, you have either a bad sensor or a bad crank pulley. There is a reluctor ring on the pulley that separates and goes bad. If you have a good square wave signal from the the crank sensor it's probably going to be the computer. I've replaced a lot of them. They do really wierd things when they start to go. Check all of your grounds first. Also, while the car is running, shake and pull on the wiring harnesses for the computer. I've seen on a few cars where a wire or 2 will go bad and cause and occational short.
SOURCE: 1991 Geo Tracker only starts with starting fluid.
Check fuel filter on both vehicles...After that check fuel pressure ...Blocking off air flow to engine will change the fuel air mixture...air deprivation changes (lessens) air flow and fools engine into reading more fuel than is actually there. Mass air flow sensor should also be checked/cleaned if no results obtained by filter change if pressure is OK.
SOURCE: Ran out of gas. Put gas in but will not start. Had
Check your fuel pressure regulator. Remove the vacuum line attached to it and hook a fuel pressure gauge to the schrader valve on the fuel input line. The gauge should read at least 40 PSI, probably closer to 50-60 or more.
If it's lower than that, you're not getting enough fuel to the engine. It may also be stuck shut, meaning that you're putting in too much fuel.
If you find that the exhaust smells of fuel after cranking for awhile, there's a good chance that you're flooding out due to a faulty FPR.
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