javiermejia86

Rough Idle on reverse, Drive and sometimes at stop.

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Good morning All, i have been having some issues with my 2013 Cadillac ATS 2.5L. When the car is cold and sometimes even when its already warmed up when i place the car in reverse or drive it vibrates like it wants to stall, Sometimes this happens when i come to a full stop as well but goes away if car is place is Neutral. When on a cold start the RPM jumps from 1100-500, then it stabilizes after a few minutes.  I have already replaced the plugs, cleaned throttle body and even pour fule cleaners but the issues will not go away, Motor mounts are good as well. What else could be causing this issue? Should i be concern? 

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You need to have the diagnostic codes pulled and post them here.  The codes will help us know what is wrong.  Is the.check engine light on?

Some parts suppliers will check the codes for you for free.  Post here


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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3 minutes ago, BodybyFisher said:

You need to have the diagnostic codes pulled and post them here.  The codes will help us know what is wrong.  Is the.check engine light on?

Some parts suppliers will check the codes for you for free.  Post here

that is the problem i am having, i have no check engine light on and i have taken to three shops, autozone and Oreilys and they put the OBD scanner and it throws no codes.  Could it be bad fuel filter? Car has 130k Miles. 

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Ok we didnt know there were no codes.  

Put a fuel pressure gage on the fuel rail and read fuel pressure.  


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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The fuel rail is located on the top of the engine.  But, I just looked at photos and do not see a schrader valve to hook up a guage to it.

In addition, it looks like there is actually a fuel pressure sensor on it.

Is this engine DI or direct injected?


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Ok yes this is a direct injection engine.  See the link below for this

Like the current generation of technically advanced Ecotec engines, the 2.5L also features a high pressure direct injection fuel system

My guess, is that you are having a problem with fouled intake valves due to the direct injection system.  You should call the dealer and ask if there is a fix or maintenance procedure to remedy this problem.

 

Read more: 

http://gmauthority.com/blog/gm/gm-engines/lcv/

 


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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I hate to be the bearer of possible bad news but this is a possibility. 

Watch this video. 

 

 


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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A lot of DI engines suffer from it. Some think adding a catch can to the PVC system helps reduce it. 

Blasting with walnut shells is what I have heard of as a fix. 

Picture shows a pretty extreme case...a Audi intake valve.

dicarbon.JPG

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As Logan noted above, here is the walnut blasting technique

Walnut Blasting Equipment for Carbon Issues on Direct Injection

 


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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10 minutes ago, javiermejia86 said:

How much would something like this cost? And would this have to be done by a dealer or a mechanic? 

It is becoming more common, I don't think that you need to go to the dealer.   The above video talks about time per port, figure the per port times $100 per hour plus R&R of the intake. 

Call around and see what you find out, but I would only go with a shop that has extensive experience with this job.

Personally, I would rather pull the head and take it to a machine shop and have it cleaned and have the valves reseated.  The only problem with that thought is, would their be a problem with re-torqueing the head bolts afterward, that would need to be determined.  Maybe Logan knows that. 

Then, as Logan noted add an oil catch can to remove oil and gunk from the PCV flow


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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2 hours ago, javiermejia86 said:

I’ll take it to a few places and see what we can find 

Good luck, let us know how this turns out


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Good Morning all, just a follow up, i will be looking into my intake valves this weekend to see if they have carbon build up, how ever i also read that it could be a possible fuel line issue? Like dirty fuel lines or something.  I have noticed that the car only does this vibrations when its cold, after the car has been on or it has been driven for 15-20 Minutes it runs super smooth and no issues at all when in park reverse or drive. 

i am thinking this is being caused by dirty intake valves as this is a direct injection engine and it has not been clean in over 90k miles. but until i look at them i will not know. Any ideas of what else it could be if the valves are clean?

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It really could be anything right now....

DI engines are kind of known to carbon cake the intake valves. 

I have 3-4 DI cars here and have never had the carbon problem that I'm aware of.

I guess we are offering ideas on what it could be. 

Pretty sure you will need a scan tool to see any engine data....one of the parameters would show the fuel pressure. No way to hook up a gauge on a high pressure system. Pretty sure you will not find a fuel filter. 

You might find this link helpful..

http://www.underhoodservice.com/direct-injection-diagnostics-taking-pressure-readings/

 

 

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As Logan notes it could be many things, I kind of did what I hate, to knee jerk to a conclusion, smack me in the head please!  . 

I have actually seen ignition wire or connection problems when cold and damp go away when warmed up. 

One thing, if this is related to a misfire due to a carboned up valve, I believe you would see misfire codes, P300 or P30X where X stands for a specific cylinder # in history or current.   Or even a flashing CEL indicating a misfire. 

How long when cold?, till it enters CLOSED LOOP?   Does it appear to be rough in OPEN LOOP?

Definitely have someone check both history and current P or powertrain codes.  Monitoring misfire codes and long and short term fuel trim would be helpful.


Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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