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Quoting a past post that also goes along with a problem i have


lilrogue78
11-21-2007, 08:43 PM
Re: Struggling with a miss what type fuel delivery system do I have ?
Your engine has CPI. The system uses the "spider" assembly. There is a fuel pressure regulator, one fuel pressure line to the injector and one return line from the fuel pressure regulator called a "nut kit", and the injector assembly. All are located under the plenum. A fuel pressure test will tell you if the fuel delivery system is working properly. If there is a leak in the system, it can cause the P0300 to be set. It can also cause poor fuel mileage, possibly a fuel odor, hesitation, stalling, hard starting, and generally poor performance.


Welp here is goes i bought my 93 blazer 4.3Vortec and has the problems described. So i changed my plugs and wires to find TONS of carbon build up and that made it run a little better. So i then changed my o2-sensor to find that it was unpluged so i was getting a Open/Shorted Oxygen Sensor code.
So i pluged it back in and ran worse so i bought a brand new one well guess what NO CODE! yay! but still the same dumb problems so i tore the EGR valve off and that was all carboned up so i cleaned it all up really nice with brake cleaner and it runs a tad bit better now. But i forgot to mention i drove it home (2miles) with about 10Quarts of oil in it and after i changed my oil and over flowing my drain pan just about it helped ALOT so if anybody knows what else to change let me know. OH btw i have yet to change my plugs again seince all these repairs

old_master
11-22-2007, 08:14 AM
10 Qts of oil? Are you sure it wasn't fuel mixed in with it? This could be a fuel system problem.

lilrogue78
11-27-2007, 04:35 PM
yea it had also of gas in it also i figured that was because of the plugs in the driverside not firing and being soaked all the time so i figured it was just running down into the oil pan from that so i looked around under it and found that the crossover pipe was crushed so i went to cut that out to replace it and about a cupfull of gas ran out and now that i replaced the pipe it still dont run right so any ideas?

old_master
11-27-2007, 05:15 PM
Check fuel pressure and leakdown.

lilrogue78
11-28-2007, 10:43 AM
You guys are great i read the "Nut Kit" bulliton and that was all i needed it was spraying so much gas out that line i am suprised it would even run i only had MAX 15LB psi ...wow but changed it and runs WONDERFUL there should be a tutorial and sticky done for that fix

old_master
11-28-2007, 03:29 PM
Here's one from the "How To" section in the Blazer forum. http://www.automotiveforums.com/vbulletin/showthread.php?t=473110

The fuel delivery system is prone to several problems, that's why fuel pressure and leak down should be checked first, whenever you have a driveability issue. Make sure you change your oil and filter now, and again after 100 miles or so. Fuel dilutes oil immediately and diluted oil can permanantly damage the engine.

lilrogue78
11-28-2007, 10:00 PM
complete oil change doen today and took it out two trackin' tonight :D ran perfect ..put 100 miles on it just wheelin so gonna do another change at 300 miles i checked the oil .... still golden brown ...must have been from alll the fuel cleaning it out

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