Got an odd issue my blazer(1999 4X4 4.3L vortec LS) likes to stall out when I put in reverse. Anny ideas

 

Check for SES codes and let us know what you see. If no codes are present do the fuel pressure and leak down tests at the test port and at the fuel filter. plenty of posts here on those procedures. How does it generally run? Rough or does it act like it has a miss? How does it idle, we need more info to help.

 

Hate to ask but how do you find ses codes. Nextly when it is running it is very smooth except for upon crank up, it idles well around 600rpm. Fuel filter is new and the fuel pump is about 1year old. Haven't checked pressure yet. Need a new gauge first

 

Does it stall as if you turned the key off or does it act like its starving for gas? Our 2000 Blazer would randomly stall and would sometimes stall while driving. It would just die like you turned the key off. The mechanics could not find the issue. If it's working (not stalled out) what kind of problem do you look for? At 1 point it stalled about 6 or 8 times while trying to put it into "Drive" from "Park" and would re-start just fine. It ran fine when it was running. Long story semi short is that after replacing the ignition switch we have not had any issues (about 3 weeks). I'm not saying this is your problem but it is just something to keep in mind.

 

Truth be told I can't differenciate that one too well it seems more like the gas but its only when in reverse not other gears ignition doesn't sound like a bad idea though

 

Mine did it too hasnt done it since i ran seafoam threw it though give it a try i ran it to almost nothing in the tank and put it it let it run for like 15 minutes then put gas in it and it went away for me idk why i read it on another forum, give it a try let me know if it helped

 

Fuel problems are not going to differentiate between reverse or drive. Its the same amount of drag. I have found that every one of these ive seen its because your timing is to high. It may run fine but at a slightly high idle. I dont know why but thats what ive found. The only other possible senario would be a bad torque converter or possible crankshaft play etc

 

Only stalls out in reverse??? I would think it has something too do with your Tranny... Torque converter possibly? Maybe some kind of sensor went bad? Just throwing it out there, I have no grounds of proof though. I don't see how it would have anything too do with fuel pressure ect...

 

 

You also had the same problem? Only happens in reverse? Ignition switch? WOW, I would never had thought about that being the issue... Learn something new every day