HomeHome  PortalPortal  CalendarCalendar  GalleryGallery  FAQFAQ  SearchSearch  RegisterRegister  Log in  

Share | 
 

 Weird engine condition.

Go down 
AuthorMessage
Mark 96 Roady



Posts : 733
Join date : 2012-06-30
Age : 59
Location : Cleveland/Ft Myers Beach FL

PostSubject: Weird engine condition.   Sat May 21, 2016 12:54 am

My 96 Roady wagon has developed an unusual problem. It runs like a top, and has for the 4-5 years I've had it, and it is happy to run on regular gas. Anyway, in the last few weeks, when driving, under normal road conditions, all of the sudden the motor makes a rattling sound like pre ignition from bad gas, or gas with too low of octane. It'll do this for maybe 4-5 seconds, rattle a little, and then the service engine soon light comes on. After the episode, it resumes running perfectly with no rattling. The light will stay on for a short period of time, then go off. Has anyone head of or experienced a similar problem? Thanks. And, no Sprocket, I won't give you my car!!
Back to top Go down
Deadmanonduty



Posts : 539
Join date : 2011-08-30
Location : Green Bay, WI

PostSubject: Re: Weird engine condition.   Sat May 21, 2016 7:02 am

Did you get BAD GAS?
Dump the fuel and get fresh stuff if its just this tank.
Back to top Go down
Fred Kiehl

avatar

Posts : 4867
Join date : 2009-11-13
Age : 69
Location : Largo, FL 33774

PostSubject: Re: Weird engine condition.   Sat May 21, 2016 7:31 am

Go with atlantadan, and check the codes before you do anything. I would suspect an O2 sensor. It might be a bad knock sensor as well. You will know what the computer is trying to tell you with the SES light.
Back to top Go down
Mark 96 Roady



Posts : 733
Join date : 2012-06-30
Age : 59
Location : Cleveland/Ft Myers Beach FL

PostSubject: Re: Weird engine condition.   Mon Jun 13, 2016 10:38 pm

I don't have an obd 2 tester, but I guess I'll need to get one. Let's just say it points to a knock sensor, as Fred has suggested. What exactly is a knock sensor? If it does what the name implies, I'm sure guessing that is the problem. Now that it has been doing this more frequently, out of the blue it starts the pre ignition thing, rattles a little, then goes away. What does that part cost, and once I determine for sure that's what it is, where is it located? Is it a simple thing to replace?
Back to top Go down
jayoldschool

avatar

Posts : 2494
Join date : 2009-06-14

PostSubject: Re: Weird engine condition.   Mon Jun 13, 2016 10:51 pm

EGR sticking would be my first guess.
Back to top Go down
Fred Kiehl

avatar

Posts : 4867
Join date : 2009-11-13
Age : 69
Location : Largo, FL 33774

PostSubject: Re: Weird engine condition.   Mon Jun 13, 2016 11:26 pm

The knock sensor is located on the block below the exhaust manifold. I may be on the left or right. The knock sensor senses vibrations caused by detonation. There may also be false knocks, but they are usually programmed out of the computer. When the knock sensor senses a knock, it retards the timing until the knock goes away.

You could also have spark plug wires arcing to each other, or to ground. On an LT1, the spark plug wires must be routed as they came from the factory to keep them from arcing. Put the metal shields back on them as well.

They are not expensive, and are screwed into the block. Depending on access, they can be easy or difficult.
Back to top Go down
Sprocket

avatar

Posts : 5430
Join date : 2008-11-04
Location : Palm Beach County

PostSubject: Re: Weird engine condition.   Wed Jun 15, 2016 12:08 pm

you can pull the codes from the AC display. many youtube and google videos on how too.
will work in the Caddy too.
Back to top Go down
Sponsored content




PostSubject: Re: Weird engine condition.   

Back to top Go down
 
Weird engine condition.
Back to top 
Page 1 of 1
 Similar topics
-
» Weird 999/911 calls etc
» [Engine Remake][EN][RU] Free Heroes 2
» how to register google search engine for phpBB3?
» Search engine not responding with any results
» PTSD Interim assessments

Permissions in this forum:You cannot reply to topics in this forum
GM Longroof Forum :: Longroof Tech :: Engine-
Jump to: