gas in oil

[93hoopty]

93 s10 blazer 4.3 w auto. code 32 Stalling and now no start. Replaced egr, map sensor and found some fuel in oil that slipped past cylinder 3 & 6. Have no fuel pressure tester. Out of experience would you say spyder assembly, injectors, fpr? or what else.

[luckymanz]

How much fuel in the oil are you talking about? This could be from the contant cranking, the plugs could be fouled due to excessive cranking. One way to check fuel pressure is turn the ignition swtich to "on" position and you should hear a "whinning" sound from the fuel pump. If not, check fuel pump relay and power at pump. If so, you can push down the shrader valve located on the fuel rail and fuel should squirt out with at least 45 psi. BE CAREFUL NOT TO DO THIS WITH THE ENGINE CRANKING. Let me know. Also,
have you checked the fuel filter?

opcorn:

[muddog321]

Look up CPI and nut kit - common leaky items under the upper intake.

[riptide44]

i vote cpi unit - the regulator is apart of it and although you can replace just the regulator your just buying time - pull the brake booster line and stick your nose right up to it and smell for gas - if yes pull the upper intake and look for a really clean spot - on the lower intake - pass side is cpi unit washing on the drivers side is nut kit - if you do the cpi do the nut kit too - just be carefull getting out the torx screw that holds the nut kit in or you will be pulling the lower intake and drilling it out - you might wabt to pull the lower anyway and change out those gaskets that will eventually leak coolant into the motor . expect 5-7 hours to do the whole job .

[jsgold]

You are getting good advice, probably the CPI or regulator or nut kit, but let me add on thing more. Invest 30 bucks in a fuel pressure tester from Advance or wherever. You need it now and will need again later. I have been thorugh two fuel pumps, and this is common on 93 or any other Blazer. A good investment to have. Can help you check for CPI troubles, fuel pump troubles, you really need it to help diagnose these things. BTW you need close to 60 lbs fuel pressure for it to even start and 54 or so at idle after it starts. Anything less and it won't run or run right. Get the tester regardless of what else you find wrong.

[old_master]

GM shop manual specifies 60psi MINIMUM during prime, (fuel pump running and engine off). After the pump shuts down, (approximately 2 to 3 seconds) pressure must remain above 55psi for several minutes.

[molehole]

Besides the Cpi and nut kit there is onw more thing you could check. The Ignition control module under the distributor made my blazer do that. Chances are it is the Cpi and nut kit as that is one of the most common problems on these blazers.

[93hoopty]

Thanks alot for all the advice, I'll be running some tests this weekend.

[jsgold]

Originally Posted by molehole

Besides the Cpi and nut kit there is onw more thing you could check. The Ignition control module under the distributor made my blazer do that. Chances are it is the Cpi and nut kit as that is one of the most common problems on these blazers.

Good advice. Mine did this trick a little over a year ago as well. Possibly fuel is simply leaking past piston due to flooding maybe? Might pick up a cheap spark tester at Advance if you do not have one. They have one that you can adjust the gap to see how far spark will jump.