I have a rough idle after replacing the intake manifold gaskets.

[darrell milgrim]

As I recall, to reduce servicing due to intermittent faults the PCM requires multiple occurrences of a fault before setting a specific diagnostic trouble code. A competent, reputable shop will not check for vacuum leaks using inflammatory aerosols. It is an unreliable process due to the rapid response of the PCM to maintain the set desired idle speed. I suggest that you find a shop with a smoke machine or buy/build one. Here's a link to one of the many available: http://www.ebay.com/itm/EVAP-Smoke-...EW-/301673812635?_trksid=p2385738.m2548.l4275

You are right sometimes u get what you pay for. Shop I use have five work bays and has installed motors and transmisson for me with no problems but they have worked on my 2001 St for three days trying to find cause of lean codes that I did not have till they replaced fuel injectors for me. Thanks for help.

 

[darrell milgrim]

Where do u hook the smoke machine up to vacum lines? If it is a sealed system how do u get a flow of smoke into the lines?

 

[darrell milgrim]

Will the smoke machine on amazon for 79.00 work to find a small evap leak? Is it worth the money?

 

[2000StreetRod]

It (like most of the other inexpensive units) requires some type of air compressor that is not included in the cost. If the compressor has a small flow then a pressurized tank is needed to extend the time of smoke injection. Just disconnect a vacuum hose downstream from the throttle body with a closed throttle plate. One possible port is the one on the intake manifold that connects to the hose from the power brake booster.