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Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Cadillac
Satisfied Customers: 15154
Experience:  30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
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I HAVE A 2008 CTS WITH CODE P0087-89. CAR IDLES WITHOUT

Customer Question

HI DAN, I HAVE A 2008 CTS WITH CODE P0087-89. CAR IDLES WITHOUT PROBLEM BUT WONT GO OVER 20MPH.
Submitted: 1 year ago.
Category: Cadillac
Expert:  Tim Mohr replied 1 year ago.
Hi, my name is ***** ***** these codes, its almost always a bad high pressure fuel pump, do you have a scanner or just a code reader?
Customer: replied 1 year ago.
Code reader, tested fuel pressure from Port and read 50 psi with constant pressure drop to 0.
Expert:  Tim Mohr replied 1 year ago.
that is the low pressure supply pump, these codes are for the high pressure pump, if you had a scanner , you could rad the desired pressure, and then the actual high pressure, if they actual is lower then the desired pressure, then the high pressure pump is bad, and we see this alot, you are going to have a bad high pressure pump, but with out a scanner it is impossible to verify,Tim
Customer: replied 1 year ago.
tim does the low pressure pump should give you a reading
Expert:  Tim Mohr replied 1 year ago.

yes, but its a low presur, and you said it has 50 psi?

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