Okay, so I replaced the fuel lines on this 2002 Blazer and now when you give it more than about half pedal or so. If you just drive normal and don't lay into it it'll cruise along just fine. Lay into the throttle and it sputters and falls on it's face. The same thing also happens if you lay on the throttle while sitting still in park/neutral. Fuel pressure doesn't drop below 50psi, tps appears to be working fine, put new fuel filter on when doing the lines, put a fuel pump in, tried a maf, dropped the exhaust from the manifolds, tried different icm and coil, it has recently had a tune up. No codes either. At a loss, never had anything like this happen before on any vehicle.

 

This started after you replaced the fuel lines only and before all of those other changes?

Whats your fuel pressure at a good idle and what is it when it starts struggling?

Do you have the ability to monitor live data with a capable scanner?

George

 

Yes it started only after the fuel lines. At least as far as I know because this isn't my vehicle and the person said it didn't do that before. I do have a scanner capable of live data.
Fuel pressure is 53-55 and doesn't go below 50 even when it sputters.

 

50 psi is low enough to cause the OEM injectors to start crapping out. I suggest the fuel pressure and leakdown test. Needs to hold 55 psi after 10 min at the schrader.


George

 

Well the boss ended up having me put a spider in and it helped a good bit, but you can only go about 3/4 pedal before it just doesn't want to accelerate. Doesn't really fall on it's face or anything, just won't go anymore.

 

If you want to investigate this further please do the 10 min leak down fuel pressure test


George