Question about GMC Cars & Trucks
1997 GMC suburban, DIED while at a light. No start since. No fuel pump sound so I replaced fuel pump and filter. Low pressure so I replaced the regulator and the spider. New rotor in distributor. Has spark, has fuel, has compression, went to a scrap yard and grabbed another ECM. STILL no start. Put old one back in. Now the only thing that's not working is the plug to the injection spider all 8 connections are constant while attempting to start. running out of money and I NEED this truck for work... Anybody have any clues?
So your thought is the common side of the injectors are not powered. I believe this is the correct schematic for a '97 suburban.
There is the ECM1 fuse but hard to believe that fuse is blown, check it anyway.
Posted on Apr 05, 2019
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Posted on Jan 02, 2017
Have you changed your oil? Rotella 15W-40. These engines really don't like old oil. It becomes too thick for the injection pump to work correctly. Another possibility is a bad cam sensor on the front of the motor. Most engines call this the crank sensor but on this engine you have to look it up as a cam sensor.
Posted on Sep 29, 2009
10psi is, as I'm sure you know, about 48psi short of what you need to get it running. Did you verify you're getting a full 12 volts at the fuel pump connector? Check the ground wire also, ohm it out to chassis ground, shouldn't be more then a few ohms. Verify it's making a good connection and the terminals are clean and tight. High resistance in the wiring or a connector in the circuit could cause the fuel pump to not output the right amount of pressure.
Did you replace the fuel pump with an aftermarket unit or an oem part?
Posted on Nov 01, 2009
on a lot of ford products there is a switch that goes from the fuel pump to the inside of one of the bedsides.
what this is, is a shock switch that turns the fuel pump off if it absorbs a hit.
its a really dumb safety feature but its effective.
there is a red button on it that u have to press to make it active again.
sometimes they just trip for no reason.
Posted on Jan 11, 2010
Hi these models are notorious for crank sensors Situated front of engine near engine oil filter. Before they fail completely the engine will shut down as soon as your engine reaches operating temperature note. The crank sensor does not throw a code half the time. Even without check engine crank sensor is possible. To confirm it's not a fuel issue open flexible air intake pipe which leads to m.a.f. Sensor. ( mass air flow ). On the engine side spray a few seconds of air intake cleaner and crank the engine over if it runs a few seconds. Fuel issue.
Air intake cleaner spray can available auto parts store. Hope it helps some for diagnostic purposes.
Posted on Jan 02, 2018
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