Turbo is not coming on. Replaced vacuum pump and lines. H...
Responses
ChristianH1123
285 days ago
Hello, I'd be happy to help you with this, and sorry to hear you're having this problem with the turbo. Do you have a scanner available? There are step by step diagnostics for this if we have a scanner that can read that boost pressure sensor/map sensor. We can check a few things without it but it would be much easier if you have one or a buddy has one you could borrow, or maybe even run to a parts store and use theirs for a minute.
ChristianH1123
285 days ago
I'll go ahead and send you the test procedure from GM for this code.
Customer
285 days ago
Well I replaced the new map with another new map, and the turbo is working. It is still dying after driving 2 blocks, I am not getting a code will look at pmd tomorrow.
ChristianH1123
285 days ago
Yeah, that's frustrating I know, been there. I would really check that harness going to the MAP, I've seen that look ok and then not actually be making a good connection inside the actual plastic connector. Monitoring that on the scan tool would help to check that as well. I hate telling people to run and get the scan tool but in this case it really is a lifesaver...haha.
Customer
285 days ago
I have one, but since I replaced the map I am not getting any codes
ChristianH1123
285 days ago
Right, sometimes it will throw a pending code if it's not seeing it all the time, or it doesn't get to see it as long as it needs to, like when it's dying after 2 blocks, it's not getting warm enough to actually run it's diagnostics. Have you verified your wastegate actuator is moving freely?
Customer
285 days ago
that is why I am leaning toward the pmd
ChristianH1123
285 days ago
Has it been hard to start also?
Customer
285 days ago
No starts great, idles fine. But dies after a block or two. If I turn it off and wait a minute it restarts, does the same thing.
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Turbo is not coming on. Replaced vacuum pump and lines. Have vacuum to solenoid, none coming out. Replaced solenoid, map sensor still the same. It. Turns off after a few miles of driving Mechanic's Assistant: Which particu...
Turbo is not coming on. Replaced vacuum pump and lines. Have vacuum to solenoid, none coming out. Replaced solenoid, map sensor still the same. It. Turns off after a few miles of driving Mechanic's Assistant: Which particular sensor are you asking about? And have any trouble codes been triggered? The map sensor, and yes code p0237 Mechanic's Assistant: What is the make/model/year of your car? 1998 gmc k2500 Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far? Yes. I have changed the vacuum pump, vacuum lines, boost solenoid, map sensor, pcv valve, fuel pump and [fuel filter](/topics-fuel-filter-gmc/).