Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hi there, I am Cam. Can I get your name please while I pull up information on that code?
Do you have a hand vacuum pump to do some testing with?
OK AJ, did you have a hand vacuum pump to test with?
Also looking at the combination of codes, its possible the vacuum hoses on the EGR control solenoid are backwards, Did you happen to check those?
OK, If you use a hose on the control solenoid, not the EGR valve, one will allow vacuum through all the time and the other will block flow. Does the one that blocks flow go to the valve or the pump?
DO you have a code chart or the diagnosis for this code? If not, open the link below.
OK, so it was backwards or it was not flowing at all?
At a start yes. Also do you have a scanner that reads live data? We will end up needing to follow those instructions in the chart to find the issue if the hoses are ok.
Its possible, but we need the computer to command it open, thats why we need the scanner to command it open.
Ok, does your scanner show live data of anything or is it only codes?
Ok, in KPA, with the engine off but key on, what does the Baro and MAP sensor read?
Thats in KPA or in/hg?
metric vs imperial.
Ok, now the baro sensor. This needs to be in the data stream somewhere and it should match the map sensor reading with the engine off.
Ok so that may be limitations on your scanner. THE baro sensor is mounted under the upper rad hose where the metal meets the rubber. Make sure there is no hose on the end of the sensor. It needs to be open to the atmosphere.
I dont suppose you have access to a different scanner then? There are only so many things we can check without it and we are at the end of the list at the moment.
Yes, you can simply reply back when you have the info.
Please bookmark this page so you can easily navigate back to it so we can continue the discussion. This is done by pressing (CTRL D on PC and CMD D on Mac). You can reply at any time for follow up information regarding this issue, even after you rate the site and I will reply.
Ok, Just reply back when you get that scanner and can work through that sheet. If you reply back, I am forced to respond to you so please only reply when you are looking for a response in the mean time.
And have a good trip where ever you are going.