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sprinkles08
sprinkles08, ASE Certified Technician
Category: Chevy
Satisfied Customers: 21984
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Chevrolet Trailblazer: Chris, thanks continued

Customer Question

Hi Chris, thanks for your continued help. I got the scanner and ran some tests. I took some screen shots for you to look at also. These are sort of freeze frames from when I would crank and very temporarily get the engine to run 3-5 seconds at a shot. I ended the day with one DTC which is also shown in the photo. Don't know if that was because the battery was starting to run low though.... One issue that was in red the whole time was the air fuel ratio, which was showing at 4.9 - 5.4. It was highlighted in red when the motor was running, and appeared to be out of range. I did not see where I could test the crankshaft position sensor. I was also showing a misfire on cyl 2,3,4 while it was running, but those weren't stored to be displayed. Take a look at the pics and let me know if anything stands out to you as unusual. The computer passed all its tests (with the exception of the code shown below at the very end of my testing when battery was a bit low).
Submitted: 10 months ago.
Category: Chevy
Expert:  Chris (aka-Moose) replied 10 months ago.
Welcome, I'm Chris (aka Moose). I normally log in after 3 pm central. Please make sure to let me know exactly what is needed from me so I can provide EXCELLENT 5 STAR service. Can you upload the images?
Expert:  Chris (aka-Moose) replied 10 months ago.
Thanks for the uploads, after looking them over. I can not figure out what is wrong. I am going to opt out and let another set of eyes try to figure it out.
Customer: replied 10 months ago.

okay thanks

Expert:  sprinkles08 replied 10 months ago.
Hello and welcome to JustAnswer!If the engine only starts and runs for a few seconds it could be losing spark, fuel, or it may be an exhaust restriction. It isn't uncommon for a restricted catalytic converter to cause a no start condition.Did the engine die while driving? If not, did the problem start after a repair, jump start, etc?
Customer: replied 10 months ago.

Sorry for the delay and thank you for the help! THe problem started after changing out the plugs at 155,000, doing a wet/dry compression test, and cleaning the throttle body. I pulled the TB and just used a soft brush and cleaner. Already tried swapping the TB with a new one and no change. The plugs got fouled up a little after the wet test, but I blew the cylinders out pretty good and cleaned the plugs off with carb cleaner. You have to flutter the accelerator a lot to get it to run for a few seconds, and keep fluttering it until it dies. Will def not idle at all, and sounds like its running on less cylinders.. very rough, like timing is suddenly off or something. Driving me crazy...

Expert:  sprinkles08 replied 10 months ago.
What was the reason for doing the compression test?
Customer: replied 10 months ago.

I had a slight rough idle (which was my reason for changing plugs) and since I wanted to see how healthy the motor was, wanted to check compression. Another mechanic here recommended the wet and dry test, but I dont think the wet was necessary. Dry was at 140-155 all cylinders. Wet and it shot up in to the 220's, and one went to 300.

Expert:  sprinkles08 replied 10 months ago.
Do you know the current spark plug condition?
Customer: replied 10 months ago.

Not really, I sprayed them clean last time I pulled them and put them back in.

Expert:  sprinkles08 replied 10 months ago.
Was anything done to clean the cylinders though? By the description it sounds like the plugs are fouled because of the oil. Try pulling a few back out and check their condition again.