1990 blazer idle problems

[santiago]

ok fellas i have a rough idle and surge i have already replaced plugs,wires,cap,mass air flow sensor,tps sensor,air idler valve,throttle body gasket,o2 sensor,air filter and i cleaned out the egr valve any advise would be a blessing thanks in advance

 

[Kiqman]

Rough idle and surge

Looked at your fuel pump? Making enough pressure? Had a problem like yours and it turned out to be the in-tank pump. Just cut a hole above the tank in your bed to access the top of the tank. Beats pulling the tank out. You can test pressure at the TBI. Good luck.

 

[dyeager535]

Ever get any codes?

 

[sweetk30]

first. what kind of blazer? s10 or full size. next what plugs for tune up? and last what motor.?

 

[fordslayer383]

who would do that

 

[pvfjr]

who would do that

Who would cut the hole in the floor?.....Lot's of people. You'd be surprised.

 

[jekquistk5]

Check your EGR Solinoid. And check for vacuum leaks

 

[icer97]

And check for vacuum leaks

Sure sounds like vacume to me. Take a can of carb cleaner and spray all around. Could be a intake gasket leaking internally, ive found these by removing the oil fill plug on the valve cover and giving her a snort of carb cleaner.

 

[REDCRO_REDNECK]

Who would cut the hole in the floor?.....Lot's of people. You'd be surprised.

no body should if they have a short bed then you have a hole in your bed for nothing. The sender is under the cab (1987 shortbed).

 

[Kiqman]

I've enjoyed the easy access a "trap-door" above the fuel tank provides. I wouldn't do it to a new rig but in my 89 it was a no-brainer. Just fabbed up a little hinge setup and seal. Once you throw the sound proofing and carpet back down you don't know it's there even standing on top of it. Lazy...yes but I've never heard anyone brag about the cargo capacity of their K5 anyway and taking those tanks out sucks. More time for mud and beer!

 

[Tracktor]

I know you've replaced the wires already, but I just went through this problem and thought I'd post my fix. It was a shorting plug wire. The cap was crocked at the plug and shorting on the heat shield. Wires were otherwise in great shape, but the heat had dried the caps out. ................