1993 GMC Sonoma Club - Answered Questions & Fixed issues

classic large vacuum leak symptoms

Three things you should check using a good code checker which can read sensor outputs - the throttle position sensor (TPS), the mass air flow sensor (MAF) and the EGR valve. While you are at it, replace the PCV valve.

You must have an egr valve for this engine to work.Sounds like you are getting oil blow-by combustion causing carbon in the exhaust which may do due to a faulty crankcase ventilation valve, bad piston rings, etc. Whatever the cause, oil combustion produces the carbon, and you will need to fix that.

Does it have compression

Probably just got a bad, new regulator. If it happens again. Check the pump pressure.

Why would you have to remove the dashboard. The Module can be accessed from under the dash on the passenger side.

Are you talking about the plastic housing part or the steel piece under that?

may have a reset button on it. That need reset. Or take off battery cable and wait for one minute and reboot your computer. Go to owners manual to see how to reboot the computer

Give http://www.xcardiag.com/ for your reference ,hope it can help you..

most likely a 2.8L if its a V6.

The problem is in the start circuit if the starter won't engage from the key. From battery to ignition switch to neutral park safety switch to starter relay to starter solenoid to starter to ground and back to battery-lights come on so switch is good, next check the neutral safety switch for power in and power out.Once you get the start circuit working so starter engages from the key, then you can address the ignition circuit for possible no spark.

timing chain check....place cylinder 1 at end of compression then the timing mark place at 0 distributor rotor should be to number 1 cylinder. if not timing chain could be out of teeth3 major things for engine is air,fire,fuel.then you say you change the distributor ....is it in good position???

it should be the red wire for power and yellow wire for memory

check battery and connection,fuel filter,air filter,spark plugs,fuel pump weak.

An engine running rich can be caused by many factors including the need to change plug wires, distributor cap, rotor, spark plugs.if you want to know what happened i think you should buy a tool to read the fault code, if you need click here: OBDII Code Scanner

Need to see diagram for 96 GMC Yukon spark plug wiring

As with any no start issue, someone will need to check for spark at the plugs and fuel pressure at the injectors to proceed.

Yes and no.If the lines have inverted flare fittings you might be able to find plugs but you may have to use short brake lines and cap the ends.They may be metric which could be tough to find.

Depending on type of engine, its usually on the back of the intake manifold near the firewall.

Do compression test that will let you know if the valves are bent or not