September 3, 2014Hello all, I have a `94 K1500 Ex Cab 4x4 with 229,000 miles on it. I have been battling some engine issues lately. Sometimes it will run fine and other times will fall on its face. The idle lopes and surges at times. Sometimes when I come to a stop or I`m coasting down the road it will die. When I restart it I have to pump the gas or hold it at full throttle. There is also a strong smell of fuel from under the hood, there are no fuel leaks just the smell of unspent fuel (running rich) like it is dumping fuel in the throttle body and needless to say the fuel mileage is horrible (8 mpg). I have changed every sensor known to man (IAC, EGR valve and solenoid, TPS, Plugs, Wires, Distributor Cap and Rotor, Ignition Control Module, Coolant Temp Sensor, Coil, O2 Sensor, MAP Sensor. I also changed the fuel pump about 6 months ago or sometime thereabout. I am at wits ends. I`m thinking the cam is wore and the valves may be burnt (hence the fuel smell). Timing is probably off too. What do you all think with the information given. I am replacing the injectors and fuel pressure regulator as soon as the parts get here. The truck has done alot of towing in its time, that`s why I`m concerned with the cam and valves. I have had a bad exhaust system on it for quite awhile also (leaks, cracked manifolds, donuts etc.) It does not throw any codes. Just wanted some new input before I look into a new engine. One more thing that may be important, all of this just started at once. The truck was running fine and I stopped at the store one day, got back in and started it up and this is what I`ve got now. Makes you wonder if it might be the computer, I dunno. Sorry for the lengthy post, any help is appreciated. Thanks.
Forums : Engines-Gasoline : 1994 K1500 5.7L Engine Problems (964 Views)
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September 21, 2014Sounds like you`ve replaced all the typical tuneup type stuff.
How`s the pattern look spraying out of the injectors? Nice and uniform like an umbrella, or spattery with larger drops?
Have you checked compression?
Have you checked fuel pressure? Replacing the FPR and pump may be a good idea, but also may be unnecessary if fuel pressure is fine.
Flat cam or worn out springs is a possibility on such a high mile motor. Not sure how to check that stuff though.
Quick internet search says "Check the dist reluctor and the top portion of the reluctor for rust at the dist shaft area. This is a common problem spot."
- wouldn`t be a bad idea to change the distributor. Would also replace the pickup coil.