My ECM on a 1993 Metro just went out and it was similar to what you are experiencing. Mine mimicked fuel system problems, but I took it to a mechanic w/ all of the diagnostic equipment, and he was able to diagnose the faulty ECM. This saved me from unneccessarily replacing fuel system parts, and was well worth the money. I found the ECM for my engine/transmission off of Ebay for $21.00 shipped. You can also get them off of therebuilt for $200.00, and used for $150.00.
If it is just one injector, it is a bad injector or a problem in the wiring harness or connector for that injector. If it is all of the injectors, it could be a fuse, the entire injector harness, a broken loose or unplugged connector on the injector harness, or the fuel pump or fuel pressure regulator.
there is a secondary fuel injector on the throtle body, if you look just under the box with dpfi on the top you will see them. one is brown and one is green if memory serves me (its been about 3 years) the lower fuel injector should be to blame here. the problem is that the dual point is just what it implies two points in other words two fuel injectors. the car normally or at low rpm will run off of the primary injector until the ecu see's fit to engage the secondary injector. in my opinion the secondary injector is cloged, damaged, or unplugged. either that or you need a fuel filter. hope i could help.
Hey Rich==The idle speed solonoid is pprobably to blame. Take it off of the throtle body and clean it with carb cleaner. Also clean th inside of the throtle body where the throtle plate is as a carbon ring forms there. Goodluck Joe I had a similar problem and the PCV tube was punctured. $20 part at a ford dealer and you can replace it yourself. I too had this problem and the PCV tube was cracked and collapsed. Replaced and all was well. I also had this problem, with my 1996 wagon.. problem was a cinked PCV hose, was very cheap, and easy to replace. Fixed the problem ;)
Some vehicles have single, throttle body injectors, others have multi-port injection, that uses an injector for each port. If it's an injector problem, the injector could be partially blocked or gummed up. If that's the case, try a little injector cleaner. If that doesn't fix it you may need to have your injectors professionally cleaned. If it's not an injector problem, it could be valve or sparkplug problems. How long since you've change the plugs? You could run a compression test to find out if it's a bad valve.
The 91 Caprice is throttle body injected and has 2 fuel injectors mounted above a Rochester throttle body. The easiest way to check for an injector that is not working correctly is to remove the air cleaner assembly, start the car and visually inspect the base of the injectors for a smooth consistent spray pattern. If the pattern is absent or intermittent on both injectors it may indicate a problem elsewhere, the ECM or a maybe a wiring issue or sensor. If it is a single injector that is acting up it could be the injector or a wiring problem to that injector which could be tested with a multimeter.
i had the same problem and after changing every part you can i bought a noid test light and traced it to a shorted fuel injector. you have to un plug and test every injector un till you find which one is not pulsing.with it unplugged the car should run mine did. then replace the bad injector,problem solved.i changed the fuelpump,filter,strainer,anti theft relayt,and the computer.before i checked the injectors so i spent a lot of money to find a $70 injector bad.i hope this helps you.
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