Rough idle pulsation and engine lag

Hi,

What you described can be caused by several things. Since you think the code had to do with an intake issue or the EVAP system, chances are there is an engine vacuum leak. That is the first thing I would recommend checking for. Here is a link that explains how to do it:

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

Now, if the check engine light is staying on, then we need to have the computer scanned again to see what the actual codes are. Have that done if it is on and let me know what you find.

Here is a quick video showing how it's done:

https://youtu.be/b2IJGfImVvw

If you don't have a scan tool, often times a parts store will do it free of charge.

Last, you questioned if certain tests can be done on this vehicle. I don't know what tests you are referring to. Please explain.

Let me know what you find or if you have other questions

Take care and God Bless,

Joe

By tests I was meaning some way to troubleshoot or evaluate something to be certain that it's the problem. Like with the alternator you can disconnect the cable from battery I cannot remember if it is the positive or negative right this second but I believe it's the positive from the car if the car shuts off the alternator is garbage and if the car does not shut off then the alternator is good test similar to that for other parts, LOL.

Hi,

Okay, now I understand what you mean. Honestly, what I would do is check for diagnostic codes. Once we establish a possible component, then we can try some basic tests.

Based on your description, I suspect it is something to do with fuel pressure, an engine vacuum leak, or even an issue with the catalytic converter.

You could use the link above to test for leaks. You could remove an o2 sensor before the converter to see if it makes a difference, or you could check fuel pressure.

If you can get the code again, it would make it easier for me to direct you. Otherwise, it will become a guessing game.

Here are two more links to help to check those things. Again, this is an educated guess based on symptoms.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

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

Let me know.

Joe

well, actually I'm no longer around that particular vehicle. I will send her a link to this conversation though so she can read it and see what we've talked about. right now I'm all about 1995 Ford Escort wagon that's got all kinds of issues, LOL.

Sounds good. Thanks for letting me know. Good luck with the Escort.

Take care,

Joe