96 caravan 2.4 liter help won't idle

I HAVE A CARAVAN THAT WON';T IDEL AND SMELLS LIKE IT IS GETTING TO MUCH GAS.
replaced the map and oxgen sensor computer and still won't run now the guy is saying it is intake vacume what is that.

 

Just curious but has anyone scanned for codes? You can get it done free at AutoZone.

 

can't have it scanned because now it has no intake vacume but good compression.
HAVE ANY IDEAS!!!1

 

Your terminology is a little confusing; intake vacuum??? Some problem with the intake MANIFOLD?

 

You can get it scanned with or without intake vacuum. The scanning is electronic and wouldn't rely on engine condition to provide information on a problem.

Scanning would have been a little more accurate for fixing the problem, although the sensors you replaced are in the ballpark with the problem. The MAP (Manifold Absolute Pressure) is driven by intake vacuum and adjusts mixture for loading and a few other things. The O2 sensor is often a problem with rich idle mixtures.

You could have a sticking EGR valve (those can be cleaned or replaced) or you could have leaky injectors (checked by testing fuel rail pressure/regulator).

Also low intake vacuum can be caused by late ignition timing or incorrect valve timing (timing belt). Usually, if the compression is good, the valve timing is OK.

I would start with TG's suggestion of a scan at Autozone. That could either pinpoint the problem or eliminate some possibilities and move you forward on figuring out what the problem is.

Hope this helps,

Bob