Question about GMC Cars & Trucks
Code p 0299 refers to turbo/supercharger ---low boost=== causes --- mechanical fault
check for all turbo hoses tight , inter cooler not split or has a hole in it
Posted on Dec 07, 2015
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Posted on Jan 02, 2017
have it tested using a manual gage if still low then main baring ore most likely bad that would mean a over hall if is really low and bearings bad should be making rattle noise when started up first few seconds
Posted on Mar 11, 2010
Testimonial: "thanks alot.truck is not making a rattling noise.we did check it with a manual gauge.it read about 10 at idol. press. gets better as you incr speed"
Before we do anything else lets do a fuel pressure check to make sure the pump is a-ok as well as the fuel pressure regulator. Your gonna need shop manual for this as well as a fuel pressure tester. If all checks out then move to the Turbo code.
Turbo code looks like the waste gate is stuck open and your not building the boost. Do a visual inspection look for any signs of overheating and bearing wear. Check or change oil as needed.
With regards to the Mass air flow I believe you have to replace it. Keep in mind this thing might be the root of you whole problem.
I strongly suggest you use the shop manual for the codes you got. it will make this repair a snap.
Posted on Mar 19, 2010
Hello! #1; The injection pump inlet hose has been known to kink which will cause this fault...The line is foam covered...#2; Have you changed the Fuel Rail Pressure Regulator?
If so, the connector and its wiring may be open or resistive...The wiring is as follows...Purple White from regulator to ECM pin #42...Yellow from regulator to ECM pin #77...Check with an ohm meter set on X1 scale...Most important is the condition of the FRPR connector...Radio shack has a product called DOXIT...It cleans contacts by merely
spraying...No-touch cleaning...Excellent product...$14.95...Two spray cans (small) one cleans the other protects...Not much is necessary...Also clean the connector for the Fuel Pressure Sensor...Wiring; Tan...Orange/Black...And Yellow,,,
Send a comment with results...Guru...Saailer
I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867
Posted on May 13, 2010
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