Engine shake on cold start
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Senior User
Joined: Dec 2004
Posts: 101
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From: northeast PA
Engine shake on cold start
For the past couple weeks on cold starts I would get what seems to be a engine shake or vibration. Once the engine idles down the shake goes away and does not occur when warmed. The IAC was changed recently.
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
I would suspect some sort of leakdown. Maybe an injector is at fault, or you might have some bad gaskets allowing oil and/or coolant into the combustion chambers. Have you had to add any coolant lately?
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Senior User
Joined: Dec 2004
Posts: 101
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From: northeast PA
No loss of the coolant lately, if it were an oil leakdown would'nt I be getting the blue puff of smoke on start-up. I had an old Chevy that did that. As a novice how would I detect leaking injector.
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
If you can get your hands on a fuel pressure tester you can measure the fuel pressure, and then see how long the system holds the proper pressure. If it bleeds down too soon, then that would support a leaky injector.
You also might try pulling the spark plugs and see what they look like.
You also might try pulling the spark plugs and see what they look like.
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Senior User
Joined: Dec 2004
Posts: 101
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From: northeast PA
After the last post my shake subsided for about a week and then three days ago CEL = cyclinder #3 misfire, one bad plug. I decided to check my maintanence records and, I realized I have had one plug go bad three different times. First at 51k, second at 70k, and now at 104k. On the previous times I can't remember a shake on start. I Have yet to change the plugs I was wondering whether I should try just changing #3 first or all of them.
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Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
How old are the plugs and wires?
IMO, you ought to have a used oil analysis done to determine if any coolant is getting into the oil. Inexpensive and very easy to do.
http://www.blackstone-labs.com/gas_engines.html
IMO, you ought to have a used oil analysis done to determine if any coolant is getting into the oil. Inexpensive and very easy to do.
http://www.blackstone-labs.com/gas_engines.html
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Thread Starter
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Senior User
Joined: Dec 2004
Posts: 101
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From: northeast PA
Today I replaced the #3 spark plug and all problems are gone. Now my question is should I have only replaced the one plug or go with the whole set. I hate the thought of only getting around 34k out of a $25 for a set of plugs.
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