Van shudders and vibrates at approximately 2,500 or 2,000 RPMs?

Hi,

If there is a vacuum leak, it could cause poor drivability issues. Since you replaced the items mentioned, what codes are now present? Did they all return or only certain ones?

Also, did this start all at once? Have you checked the fuel pressure to make sure it is within the manufacturer's specifications? If not, here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you have a live data scanner, with the engine running and at operating temperature, check the short-term fuel trims and let me know what they are.

Let me know.

Joe

Hi,

It's interesting the same codes have returned. Here is what I'm going to suggest: First, make sure there are no engine vacuum leaks.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

If there is nothing found, we need to be specific to cylinder 3 on the next checks. It may be related to a fuel injector or a compression issue in that specific cylinder.

You do have the P0300, so that is why I'm thinking a vacuum leak and suggesting the check. Is cylinder 3 the only specific cylinder misfire?

Let me know.

Joe

Hi Cory,

It sounds like it has been fixed. Is that correct? Let me know.

Take care,

Joe

Hi,

Thanks for the update. If anything changes, let me know.

Take care,

Joe