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Wayne Crawford
Wayne Crawford, Shop Owner
Category: Cadillac
Satisfied Customers: 3904
Experience:  General Repair Shop Owner
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I have a 2005 Cadillac Escalade. The check engine light has

Customer Question

Hello. I have a 2005 Cadillac Escalade. The check engine light has come on, and it flashes when I try to accelerate. It has no acceleration power, and the gas mileage has gotten terrible. It is giving a PO300 code. We have changed the spark plugs and wires, all 4 O2 sensors, the right side catalytic converter. What else can we do?
Submitted: 5 months ago.
Category: Cadillac
Expert:  Wayne Crawford replied 5 months ago.

Hello. My name is ***** ***** I will be helping you today.

Does your scan tool have live data on it?

Customer: replied 5 months ago.
I'm sorry, I had to step away for work. I have a Craftsman OBD 2 & 1 scanner, model 20899. It had software to link to a PC, but I had to get a new computer, and the disk won't read to download onto my new computer. I can't find a software download for it. so, I guess...no.
Expert:  Wayne Crawford replied 5 months ago.

And its not setting a code for an individual cylinder?

If you spray brake parts cleaner or carb cleaner or something around the intake does it smooth out for a second?>

Customer: replied 5 months ago.
Just a minute. I've got to run down to the auto parts store to buy some. Our can won't spray.
Expert:  Wayne Crawford replied 5 months ago.

Take your time.

Customer: replied 5 months ago.
39;Ok. That didn't do any good. The car idles good when you start it, but as soon as you give it gas, it chugs, loses power, and tries to die.
Customer: replied 5 months ago.
Then, it won't idle good again until you shut it down and let it sit for a while.
Expert:  Wayne Crawford replied 5 months ago.

Have you checked the fuel pressure? Sounds like a bad fuel pump.

Customer: replied 5 months ago.
No we haven't. Hubby will find his fuel pressure gauge and check that.
Customer: replied 5 months ago.
Fuel pump seems to be holding at 50 PSI. It's been on there for about 5 minutes.
Customer: replied 5 months ago.
Hubby wants to know if possibly cam sensor or crank sensor. Or some module or relay on fuel system?
Expert:  Wayne Crawford replied 5 months ago.

No. Have him leave the fuel gauge on and run it until its acting up and monitor the fuel pressure then. Let me know what the fuel pressure is reading while its missing.

Expert:  Wayne Crawford replied 5 months ago.

Sorry for the delay BTW.. I have been in a phone call for a bit.

Customer: replied 5 months ago.
No worries. I sincerely ***** ***** help. I'll get back as soon as we get that reading.
Expert:  Wayne Crawford replied 5 months ago.

Sounds good, I will be standing by.

Customer: replied 5 months ago.
I apologize, it was holding at 60, not 50. It's still at 60 when it's acting up. It's not going down at all.
Expert:  Wayne Crawford replied 5 months ago.

Does the scan tool have a crank sensor learn "test" on it?

Customer: replied 5 months ago.
I just found live data on the scanner. It says:
Fuel Sys 1: CL
Fuel Sys 2: CL
Calc LOAD (%): 24.7 (this is going up and down slightly)
ECT (F*) 170
STFT B1 (%): -2.3 (his is varying between 0 and -4)
LTFT B1 (%): -1.5 (this is steady)
STFT B2 (%): -0.7 (this is varying between 0 and -2.3)
LTFT B2 (%): 7.0 (this is steady)
MAP (in Hg): 12.9
Eng RPM: 562 (this is varying between about 530 and 580)
Veh Speed (mph): 0
Spark Adv (*0): 15 (this is varying between about 12 and 20)
IAT (*F): 95
MAF (lb/min): 1.037 (this is varying between 0.992 and 1148)
TPS (%): 12.9 ( this is varying between 11.7 and 13.3)
O2S B1 S1 (V): 0.030 (this is varying between about 0.025 and 0.9)
STFT B1 S1 (%): -2.3 (this is varying between 0 and -2.3)
O2S B1 S2 (V): 0.795 (this is varying between 0.78 and 0.82)
STFT B1 S2 (%): NA
O2S B2 Si (v): 0.730 (this is varying between 0.05 and 0.805)
STFT B2 S1 (%): -0.7 (this is varying between 1.5 and -0.7)
O2S B2 S2 (V): 0.035 (this is varying between 0.035 and 0.045)
STFT B2 S2 9%): NA
OBDSup: OBD2
PTO Status: OnI jus started pressing button on the sensor and found this.
Expert:  Wayne Crawford replied 5 months ago.

Gotcha. You got a vacuum leak on bank 2. Spray your carb cleaner around while watching that screen and look for your STFT on bank 2 to jump. When it does you are in the area of the leak.,. its most likely an intake gasket.

Expert:  Wayne Crawford replied 5 months ago.

See if some more playing leads you to a misfire counter too. It would help to know which bank is misfiring.

Customer: replied 5 months ago.
Ok. Great! Well change the gasket tomorrow, and I'll let you know! Thanks!
Expert:  Wayne Crawford replied 5 months ago.

Sounds good. I will be standing by.

Customer: replied 5 months ago.
Ok. The gasket had been changed, both knock sensors, CAM sensor. Now it's giving a P0107 code.
Expert:  Wayne Crawford replied 5 months ago.

Can you try swapping the number 7 coil with another cylinder and clear the code and see if the misfire follows the coil??

Customer: replied 5 months ago.
Well, turns out the MAP sensor wasn't plugged in good. He did switch out the number 7 coil wroth a good one that he had here anyway. Now we're back to the generic P0300 code. Should I get the live data again?
Expert:  Wayne Crawford replied 5 months ago.

Yes

Customer: replied 5 months ago.
Fuel Sys 1: 0L
Fuel Sys 2: 0L
Calc LOAD (%): 31.7 (varies between 30.5 and 33.3)
ECT (*F): 140
STFT B1 (%): -4.6 (varies between -1.5 and -6.2)
LTFT B1(%): -3.9
STFT B2 (%): -0.7 (varies between 0 and -1.5)
LTFT B2 (%) 14.8
MAP (in Hg): 15.3 (varies between 15 and 15.9)
Eng RPM: 545
Veh Speed (MPH)/; 0
Spark Adv (*): 15 (varies between 12 and 25)
IAT (*F): 96
MAF(lb/min): 1.279 (varies between 1.175 and 1.414)
TPS(%): 10.5 (varies between 10.1 and 11.3)
O2S B1 S1(V): 0.775 (varies between 0.040 and 0.795)
STFT B1 S1 (%): -0.7 (varies between 0 and -2.3)
O2S B1 S2 (V): 0.540 (varies between 0.0.540 and 0.775)
STFT B1 S2 (%): NA
O2S B2 S1 (V): 0.780 (varies between 0.095 and 0.800)
STFT B2 S1 (%): 2.3 (varies between 0.7 and 4.6)
O2S B2 S2 (V): 0.040 (varies between 0.030 and 0.050)
STFT B2 S2 (%): NA
OBSSup: OBD2
PTO Status: On
Expert:  Wayne Crawford replied 5 months ago.

And now it looks like you have a BIG vacuum leak on bank 2. Can you spray some carb cleaner or something around the intake while monitoring the STFT on bank 2?