Rough Idle and Hesitation

bwalker said:

Hello All,

I have a 2004 Ram 1500 5.7 and I am having an issue with a rough idle and hesitation at initial acceleration. Once up to speed all is fine but when I pull to a stop, there is a rough idle and hesitation to start again. I am getting a code P0440 from it which is for the evaporative emissions system. I have checked the gas cap and the gasket is in good shape and from what I see and it should be getting a good seal. Just wondering if anyone has crossed this problem before so I don't start throwing parts at something I'm not sure about.

Thanks Much!

Click to expand...

SYKRAMMAN said:

Sounds like a bad vacuum leak, check all lines especially the ones behind the engine, Smoke test it if you can't find anything.

Click to expand...

bwalker said:

I checked the vacuum lines as best I could and didn't find anything but I will get further inspection done with a smoking machine. Did I mention that the problem was intermittent. One moment it runs perfect and another, it is shaking violently. Not sure if this helps you with diagnosis.

Thanks!

Click to expand...

SYKRAMMAN said:

If it was a vacuum leak, I think it would be consistent. Now that I know it's intermittent, now I'm suspect to a faulty sensor, your going to have to get the truck on a computer to have a peak inside pcm, good luck bud and keep us posted.

with it being intermittent, there's not much you can do without a good scan tool.

Do any cel's come on when it happens?

Click to expand...

bwalker said:

I will check that out. I have a cheap scanner from Amazon and I am getting the code P0440 which is for the evaporative emissions system. Would I have to take it to a dealer to have them check it?

Thanks![/QUOTE

You can take to any local shop that has the right equipment, no need to waste $ at the stealerships.

Before you do that, take a peak about half way down the truck on the driver side underneath on the frame rail is where your evap system is, check all those hose and fittings first before spending on getting it scanned.

Click to expand...

SYKRAMMAN said:

bwalker said:

I will check that out. I have a cheap scanner from Amazon and I am getting the code P0440 which is for the evaporative emissions system. Would I have to take it to a dealer to have them check it?

Thanks![/QUOTE

You can take to any local shop that has the right equipment, no need to waste $ at the stealerships.

Before you do that, take a peak about half way down the truck on the driver side underneath on the frame rail is where your evap system is, check all those hose and fittings first before spending on getting it scanned.

Click to expand...

Sounds good! Thanks!

Click to expand...