Test?

 

OBD-2 Drive Cycle:
http://www.obdii.com/drivecycle.html

General Motors Driving Cycle

A complete driving cycle should perform diagnostics on all systems. A complete driving cycle can be done in under fifteen minutes.

To perform an OBDII Driving cycle do the following:

Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and within 6°C (11°F) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.

Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.

Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.

Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.

Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.

Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.

Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.

Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Reprinted on OBDII web site courtesy of General Motors Corporation
© General Motors Corporation

 

I just unplugged fuel injector #5 and there was no change! Now im getting somewhere!

 

Got spark, must be the injector. $126 each at advance!

 

8 brand new oem injectors and it still runs like garbage. Msd wires and ngk plugs will be here next week. If that doesn't work then ill do knock sensors. If it still runs bad I'm trading it in.

 

Throwing parts at an engine is an expensive, frustrating way to do repairs as you're finding. I'd take it to a reputable dealership if I were you.

 

I had a tech check it out and all he said was plugs and wires.

 

Certified tech at a dealership?

If it does turn out to be plugs & wires, I'd change the oil & filter afterward. Improper combustion leaves fuel in the chamber which migrates to the crank case and contaminates the oil.

 

How can I have spark and fuel in cylinder #5 but no fire?

 

Took out plug 5 and it was half missing and had thick oil junk all over it. Did a compression check and it had 0psi! Put a new plug in and it runs great, just smokes like mad..

 

 

if you have no compression on that cylinder you need to figure out why.

previous owner say anything about a mis-shift or overrev?