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Why will a 1997 gmc suburban with a 5.7 liter engine not start. it has fire and 40 psi of fuel pressure?
Wiki User
∙ 12y ago
For an engine to run it needs the following; Fuel, Air, Compression and an Ignition source. (the heat of the compression in a diesel, but that doesn't apply here) If the engine turns over, it is getting fire, fuel and air TO THE COMBUSTION CHAMBER, not just in the injection rail, it sounds like a compression issue. Has the engine been run hot recently? More likely the injection system isn't getting power. The elctrical timing could be off, especially if the distributor has been replaced, mechanical timing might be off if the timing chain has jumped a tooth or more on one of the timing gears. It could be many more obscure reasons. Water in fuel,, fuel filter, air filter plugged, possibly be getting way too much fuel..........Might not be tapping the dash in the proper spot and/or holding your mouth right!!!
Three other items to check when the engine turns over but will not start are the height tension wire between the distributor and the coil if it's external; control module in the distributor and the timing chain could have jumped a tooth or simply worn out.
Wiki User
∙ 12y ago
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