Samrider789

So I bought a 91 pickup with the v6 in pretty good shape for cheap because it wasn't running. One fuse and a wire connector later thanks to this sight the o2 censor has stopped blowing the efi fuse. Once running the cel was on and throwing the knock sensor code, turns out the shop that did the heads never plugged it in and left the plug under the intake. I pulled the intake and put a new pigtail on since the old one was crap and put the motor back together. Now the cel is off but the truck is running horrible. Seems to run really rich to me, burning my eyes starting it in my garage, plus it has zero power and will almost choke out from idle if you give to much throttle at once. Any ideas on what I could have put back wrong or what's going on? Thanks in advance!!!

ChinkTruck

I would suspect a intake leak, with the engine running take a can of carb cleaner and spray around the intake manifold/ plenum. If theres a leak you'll hear the RPMs change. Did you use a new gasket on the intake? You should always do this even if it looks good apon removal.

Samrider789

I used all new gaskets and I tried that once but will try again once I am home from work.

scope103

Check ignition timing. Check for stored codes.

(Wouldn't an intake leak make it run too lean, rather than too rich?)

Samrider789

I never had the timing belt off with the intake but I can check to make sure timing is ok. With knock unplugged the truck ran better then what it does now. I even tried unplugging the knock sensor again to make sure it wasnt that.

ChinkTruck

yeah it would but would still make it run like garbage, plus with efi, maf and o2 sensors kick in and tell the computer to over compensate fuel so you still get excess fuel odour. Checking code is always a good idea. Check the basics too, plug wires, o2 sensor plugged in. Etc.

scope103

Ignition timing and valve timing are two different things. Putting the timing belt on wrong will change both, but ignition timing can change for lots of reasons without affecting valve timing.

Plus, you don't know if the ignition timing was correct any time you have owned the truck.

Samrider789

I won't be home until Wednesday or Thursday but I will start checking everything then and see what I come up with. Thanks for the info and I'll keep everyone updated

Terrys87

iTrader: (1)

I do not know the 3.0 but if you just pulled the Intake, I would suspect you have a vacuum leak or got some hoses back on incorrectly.

Samrider789

Are there any specific vaccum lines I should check? I followed the diagram on the hood for the three lines on that and found pictures on the internet for the lines going to the ac idle air and the power steering. I am pretty positive those are correct. Just so y'all know this is the first time I have messed with a Toyota so anything obvious don't hesitate to say it haha

robertd33

Samrider789

I found an article that was exactly like that so I have all vac lines correct.

Samrider789

So I'm finally home and I started pulling plug wires and found that on the 2,4,6 side of the motor is firing! Where do I go from here

robertd33

did you chase the spark on the other side?
plug yes/no?
wire end yes/no?
distributor yes/no?

ChinkTruck

Ditto what robert said, thats wierd that one whole side of the engine isn't getting spark, this would make me suspect the distributor is shot, or maybe cap and rotor, check the rotor and contacts under the cap, if they're fried on that side it could be whats causing it. Find it hard to believe 3 plugs or plug wires went bad all at once but you never know?

Samrider789

Sorry I think I confused by saying firing. They have spark all the way to the plug but just make zero difference when you pull even all three off the cap at once. Also when I try to check the timing the mark just keeps moving around the pulley. I pulled the plenum back off to check the injector plugs and tried cranking it over to see if I could see fuel but I couldn't tell looking down the intake.

Samrider789

The only thing I can think of that would do that would be if I didn't get the lower intake down all the way on that side and its pulling air but the carb cleaner doesn't seem to make any difference no matter where I spray it.

robertd33

it's a safe assumption there is air in the cylinder, so if there is spark, that leaves fuel.
check the timing, fuel rail/regulator, make sure that side of the loom for the injectors isn't cut.
if you already have the plenum off, you can squirt-test an injector.

Samrider789

Also forgot to add I have a throttle position sensor circuit code 41

Samrider789

I can't check the timing because the mark just keeps spinning. I'm assuming it has enough pressure because the cold start injector line has plenty. What do you mean by the loom? How do you squirt test an injector?