98 k1500 won't start NEED HELP!!!

[Mcat500]

Thanks to all for the suggestions. Will post tomorrow with update

[jremington59]

By now you've probably soaked the plugs. Check them because if you do find the problem she might not start if the plugs are fouled.....

[Mcat500]

Hi all, here's the update.

I've tried 3 different keys, no go. Checked the MAF and MAP sensors, all appears go, still no go. Pulled ignitions switch apart, all looks good (but I'm not sure what to look for here), still no go. Pulled cap and rotor to check for moisture (oh ya, its been raining and snowing here for about a week now), all looks clean and dry.

Well I'm know offically at a LOSS. Stupid Vehicles, why do they make them soooooooooo difficalt to fix.

[Mcat500]

I've been reading, what about the oil pressure/fuel switch? Could this cause the problem? Where is it located on the truck and how do you test it?

[Crmzendrgone]

If I am not mistaken should be near the rear of the engine block by the distributor. This is a Vortec correct? I am mistaken I was thinking it was the 350ci. Hope this helps

4.3L Engine

1. Disconnect the negative battery cable.
2. Remove the distributor.
3. Disconnect the oil pressure sensor electrical connector.
4. Hold the oil pressure sensor fitting with a wrench.
5. Remove the oil pressure sensor using an oil pressure switch socket. Note the alignment of the oil pressure sensor fitting prior to removal.
6. Remove the oil pressure sensor fitting, if necessary.
   
   
   
   Fig. Oil pressure sensor location-4.3L engine
   
   

To install:

1. Install the oil pressure sensor fitting, if removed, and tighten to 11 ft. lbs. (15 Nm). Do not loosen the sensor fitting. Tighten the sensor fitting until it properly aligns. Do not tighten the sensor fitting more than one turn to align.
2. Install the oil pressure sensor.
3. Hold the oil pressure sensor fitting with a wrench to prevent from turning and using the oil pressure switch socket, tighten the oil pressure sensor to 22 ft. lbs. (30 Nm).
4. Connect the oil pressure sensor electrical connector.
5. Install the distributor.
6. Connect the negative battery cable.

Testing





WARNING
This test is for testing the sensor only. Verify that the engine has sufficient oil pressure before conducting this test.

1. Disconnect the oil pressure sensor electrical connector.
2. Connect one lead of an ohmmeter to the sensor terminal and the other lead to the sensor body.
3. With the engine off, the resistance should be approximately 1 ohm.
4. Start the engine. The resistance should increase as the engine speed increases.
5. If not, replace the sensor.

[leolkfrm]

are the plugs wet with gas?

[Mcat500]

Hi All, here is the update as of today (Nov2)

The truck sat for the weekend, didn't do anything to it since friday. Today attempted to start the truck, no go. Changed the coil and ICM with spares I had, still no go. Removed the spark plug form #1 cylinder to check it, plug was good, not fowled. Recheck the spark on #1 cylinder using the plug I just removed and while check the spark, it started. Stopped the motor, put the plug back in, restarted the motor and has run without any problems all day.

So, if anyone has any ideas why it finally decided to start, I'm all ears

Thanks for the help everyone

[Crmzendrgone]

the only thing I can think is you wiggled something to make a good connection. Still thinking though.