My avalanche is throwing codes for p0301 p0751 p0496 and ...


My avalanche is throwing codes for p0301 p0751 p0496 and p0521. I changed the canister purge valve solenoid and the truck still smells like it's running rich and has smoke coming out of the [exhaust](/topics-exhaust-chevy/) when a...

My avalanche is throwing codes for p0301 p0751 p0496 and p0521. I changed the canister purge valve solenoid and the truck still smells like it's running rich and has smoke coming out of the [exhaust](/topics-exhaust-chevy/) when at idle. Then taking off it is very shaky. Once I'm going down the road everything seems fine but as soon as I stop it smells really bad like fuel again and idles really rough Mechanic's Assistant: Is the rough idle intermittent or consistent? Intermittent Mechanic's Assistant: What is the make/model/year of your car? 2007 Chevy avalanche 2wd ltz Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far? I am trying to. All I have done so far is check for spark and replace that solenoid Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? I've been told by others that it may be the computer

Automotive Expert
Hello and thank you for using Just Answer, my name is \*\*\*\*\* \*\*\*\*\* I will be glad to help you. It looks like you have several unrelated faults here but the cylinder 1 misfire combined with smoking exhaust makes me think you have an injector leaking. Can you unplug the cylinder 1 injector and see if it stops smoking?

I haven't tried that but I'm at work now but I can try.
Automotive Expert
It will still have the misfire, I just want to see if that corrects the fuel smell and exhaust smoke

Let me walk out and try

Ok it's still smoking and the smell is still thereThough not as strongSmoke still very present but smell not as badAre you still on?
Automotive Expert
I am going to do a little digging around tomorrow for you
Automotive Expert
Ok so p0521 is an oil pressure fault, p0751 is a transmission shift solenoid fault, p0496 indicates a faulty purge valve that you already replaced. Have you tried to get the misfire to move by swapping plugs? P0301

What others are asking

How do I adjust the front seat?
Front seats in the car come with either automatic or manual settings, depending on the model. Both of them can be adjusted for the most comfortable position while you drive. The settings are almost identical for the driver and front...
I cannot shift gears.
The bottom of the gear shifter tube attached to the shifter cable and when you move the shifter it moves the shift cable. On these vehicles they may have a few different issues like the shift tube broke, the bottom...
Rattling sound
Hi. Maybe the light is the rattling sound you're hearing. If the light housing is loose, it will vibrate upon acceleration and cause noise. However, your rattling noise has countless potential causes. The only way to find the answer is...
Electrical problems
The seat switch would need to be checked for a short to the power which is keeping the switch engaged in one direction or another. I recommend having a mechanic, such as one from YourMechanic, come check the system to...
Clicking noise under the hood? sounds like bearings..
I would think the noise is from the belt tensioner pulley or the bearing in the compressor pulley. I would have the noise checked sooner then later since a failed bearing or pulley can leave you stranded on the road...
the fan runs on for 1 or 2 minutes after engine cut off, a little water comes out the overflow tank, sometimes
This sounds like one of the few possibilities left would be the coolant fan switch. This is a relatively easy and inexpensive fix. You may want to test the power to this switch. When these switches become faulty they tend...
Frank, Id like to install cruise control into a chevy express 1500 AWD that currently does not have it. Is that possible? 2012 Chevrolet Express 1500
Hi there - yes, that would be possible, although the cost effectiveness of adding this feature to your current vehicle may not make sense. Adding cruise control could be done by either finding another Express van in a recycling yard,...
Misfire happens at 1500 rpm's.
Hi there. Check the fuel injectors one at a time by disconnecting the harness and see if the engine stumbles or not. If the engine stumbles when the injector is turned off, then the injector was working. If the engine...
Idler pulley broke off metal it was attached to after results from a crooked pulley and multiple serpentine belt slips.
You're right in that the stress will be too great and it will come apart again. This is not something you can fix with glue. You will need to take off all of the broken parts and replace them with...