Car keeps stalling while in drive at stops idling and will sometimes randomly stall while driving out of no where then throws code 33 and doesn't want to start takes multiple cranks or will stall right after start up ive replaced starter, fuel pump, fuel filter, fuel pump relay, maf power/burnoff relay, maf sensor, New ac delco plugs, oil filter, ohm'd injectors all either 17 or 18 any ideas

 

Anybody suggestions ? Also set iac it ran good for a few miles then went back to stalling and set ses light for code 33, still unsure how to check tps sensor what do i set the multimeter to? And how do i check fuel pressure?

 

I w wandering how to check the tps too. I know the fuel rail on the passenger side has a spot to hook up a fuel pressure tester on it towards the back.

 

Hello,

Check your TPS by measuring the voltage between the top two wires on the TPS connector (A and B, I think). It should be 0.54v at idle and it should move smoothly up the scale as the throttle is gently increased. You can partially remove the rear cover of the TPS connector and place the multimeter probes in the back of the weather-pak connector.

Sometimes injectors can ohm-out okay, but still be leaking.

Code 33 has something to do with the TPS as well...read over the attachment.

Hope this helps.

 

So i adjusted the tps today its at 0.54 volts at idle and 4.78 at WOT, Havent goten code 33. I took it for a spin and isn't stalling anymore although my drive idle is a little on the high side at stops 900 rpms and in park about 1500 rpms

 

Ok good, glad to hear it. That was step one, now...

You may need to reset the minimum idle:
Jumper A and B on the ALDL.
Key on, wait thirty seconds.
Unplug IAC under TB
Start vehicle
Adjust idle via idle screw under aluminum plug on back of TB, driver side
(Check what your idle should be, 450-550 rpms?)
Key off
Reconnect IAC
Remove jumper
Restart your car and now it should be idling nicely, hopefully.


Hope this helps.

 

that did help ty skibum its now sitting at 450 in D and 1000 rpms in P.

 

Glad to hear it!

1000 in park may be a little high, thought it would be around 550-650, hm.

There may be some carbon buildup on the IAC or a vacuum leak somewhere. Check over all your vacuum hoses by grabbing them with your bare hand. If they leave your hands covered in "rubber," replace them.

Hope this helps.

 

Will do i was thinking the same thing about the iac being dirty, previous owner didn't even know what the iac was and insisted it didn't have one lol i laughed so im sure it could use a good cleaning, as far as vacuume leaks go i know i have two hoses that need to be routed correctly, one being the hose next to hose that goes to egr, that goes into a T fitting then to canister, and then i have another hose im not to sure about it, comes out the wireharness(not the one that goes to the vac ball)

 

Vacuum hoses can get annoying, just pay close attention to the vacuum diagram. For instance, my EGR hose goes from EGR to EGR solenoid to T fitting to bottom of the TB, the other half of the tee goes to a canister as you describe. The vacuum hose from a wiring harness may be related to the climate control. You can always post pics here of whatever is in question.

Hope this helps.

 

You have to reset your TPS voltage to .54v again AFTER you set the minimum idle speed.