Bad Gas Mieage/Cutting Out

[LS/Vtec]

I had an ls back in the day getting terrible milesge from a bad map.

But check compression before anything else.

the compression is prolly like 80 across the board lol. But even with low comp i dont think it would cut out. It's gotta be electrical. Like dizzy or fuel pump. Im gonna borrow my friends dizzy and try that out.

[LS/Vtec]

Swapped throttle bodies with one with a known good tps and the problem hasn't came back. Only time will tell.

[Mowgli]

I get about 200 miles out of 8.5 gallons. Only run 93.

[LS/Vtec]

Problem started occuring agan. So it was not the TPS.

[justinr3459]

im curious about this because my teg is having the same issue. no cel and i never get more than 200-220 a tank. last one i got only 180.
new- cap/rotor, ngk wires, ngk plugs, fuel filter, walbro fuel pump,

[letrina69]

new wires ngk new ngk plugs dizzy 5 months old new oil change new engine harnes uncut trailer full of diff ecus and i still have this bs fucking problem the only cel light i got is the iat but i didnt have this light before i changed the old harness my car is a 93 lx auto shell converted to 5 speed i was told that the iat can make you run like shiet but not like this also having the same simptoms on highway bumppppp someone helpppp plzzz!!

[LS/Vtec]

new wires ngk new ngk plugs dizzy 5 months old new oil change new engine harnes uncut trailer full of diff ecus and i still have this bs fucking problem the only cel light i got is the iat but i didnt have this light before i changed the old harness my car is a 93 lx auto shell converted to 5 speed i was told that the iat can make you run like shiet but not like this also having the same simptoms on highway bumppppp someone helpppp plzzz!!

my cars been in the shop since the begining of Feb. But once i get it back i'll be trying to figure this out again.

[doitpropa]

my lsv was fuckin up like that i changed coil and had icm tested at advance .. that was no help.. got a brand new dizzy its better then ever so i think its a problem in the bottom sensors of dizzy always good to make sure its not just sticking like worn out my boys ls dizzy u could barely turn by hand it was seizing up so bad

[letrina69]

yo i whent today and checked out my spark plugs they werrent gapped to specs so did that took a spin felt a lil better alot smoother but still had the problem so then came back and took out the timming gun and it was of timming by a lil bit my friend adjusted the dizzy back to stock(it was advanced) then it was on timming then took it for another spin still did the same bs so i said fuck it open up the dizzy to see if there was anything up cause at this point i even swuaped out the iat with a used one and i was still getting the code so we i took the cap of i noticed my rotor had like a spot of black(wear) on where the rotor meets the cap so i went to un screw the rottor and the fucking screw was looose af!!! i mean i can literitly take it off with my hands so i went and got a new rotor and cap and put it on i had to use the old cap since the one they gave was the wrong one then i took for a spin and it didnt do the sputter but i felt a little lag i mean little.. compared to how it was before the lag is basicly nothing so ima wait til tom to put new cap on and see whats up also gonna put back the dizzy where it was set originaly to see if it helps so long story short check tthe rotor to see if its making proper contact cause i kno mines wasnt since that screw was loose smfh bumpppp and gl!!!!

[LS/Vtec]

When I took my cap off. My screw was not in my rotor. but i put one and it didnt fix it lol.

[93supercoupe]

you could always throw a s300 and datalog everything. unless you have a nice snap on scanner or something similar that can do live data.

If this were my car, id start simple.

Full tune up, even if it doesnt need it, it prolly needed it.

Good grounds

Swap dizzys

swap injectors

clean filters

check compression


But none of this will help if you have a hurt motor, so check the compression.

[93supercoupe]

set base timing

confirm cam timing

Fuel pressure regulator, check it with a vacuum pump

[kevin]

you could always throw a s300 and datalog everything. unless you have a nice snap on scanner or something similar that can do live data.

If this were my car, id start simple.

Full tune up, even if it doesnt need it, it prolly needed it.

Good grounds

Swap dizzys

swap injectors

clean filters

check compression


But none of this will help if you have a hurt motor, so check the compression.

x2

sometimes you just have to walk away for a bit and clear your head. answer could have been right in front of you the whole time.

[cdoc9]

Just torch the damn thing and collect insurance

[letrina69]

Changed ma cat today since I did put all the dizzy stuff and it did not help...so chanched cat no sputter at all at the rpm range where it did It revs smooth right through it and vtec so check also for faulty cat ima see if it does it on my way to work to confirm