jdw1

when i first start my truck up and take off its starts bogging down and jumping and wont hardly go. i have to stop and rev the engine up a little bit and then it runs just fine. it only happens at start up even if the engine is warm or cold. cant figure out. what could it be?

abecedarian

have you checked the vane in the air flow meter to make sure it's moving smoothly?
what condition are your plugs in and what's the gap set at?

jdw1

checked my plugs and they are normal color but the electrode in all four of them have a split in it. i dont know if thats normal or not.

jdw1

my plugs are BPR5EY

abecedarian

those plugs have a groove cut in the side electrode- the theory is that the arcs occur more easily on a sharp edge and since the electrode has two sharp edges near the center electrode, it should fire more easily.
gap should be .032" iirc.

jdw1

i just replaced the plugs with new ones set at correct gap. replaced plug wires, rotor and cap. still does it but not as bad. put vaccum on egr and the truck died so egr is fine. anything else i should check?

abecedarian

well... many things can be checked:
I'd double check timing and maybe change the fuel filter if it's been a while...
... fuel injector treatment like Seafoam or Berryman's....

Throttle position sensor check: http://www.4crawler.com/4x4/CheapTricks/AFM/index.shtml
Air flow meter check: http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml

jdw1

I replaced the fuel filter about 30,000 miles ago when i put the engine in. put a new tps on about 15,000 miles ago. i ran seafoam through the vaccum hose that connects to the brake booster today and that didnt help either. i have a cheap bosch o2 sensor which i replaced about 15,000 miles ago also. could it be my o2 sensor? how do i clean the cold start injector?

94svt50

mine did the same thing, but only once it had been warmed up and turned off for a short period of time. After i replaced and tested about every component it ended up being the bosch 02 with only 10k on it. Switched to the denso brand and it fixed the problem.

jdw1

i guess i buy a denso

jdw1

man i ordered a denso o2 sensor just now for $47 shipped. where are you guys paying $130? heres the link: http://densoproducts.com/resultsApp....ctCategoryID=2

86 SR5 4x4

iTrader: (1)

My truck is doing the same thing. Ive replaced the plugs, wires, cap, rotor, and borrowed the coil from my 87 4 runner. I also swapped my 02 sensor from the 4 runner and same thing. When I unplugged the 02 sensor it ran about the same. Its wierd because whenever im sitting still ill turn the lights on and the engine jumps for a second. At idle and with the lights on, if I steer it starts bogging and popping. You should test your truck to see if it does this, if so weve got the same problem. Im going to be replacing my 02 sensor tomorrow and then ill try my air flow sensor from the 4 runner.