Overrevving damage?s
Thread Starter
Advanced
Joined: May 2016
Posts: 95
Likes: 7
From: Tolland Massachusetts
Driving with both feet on the pedals
The engine looks and sounds fine now. Doesn't seem to be any lingering damage. No unusual noises. I've yet to check the coil. The parade and the travel to and from it were the longest period of time I have been continuously running the car since I bought it. It was also the hottest trmpeature day I had ever driven it during. It was the first outing since I had the A/C condenser and drier replaced. I had just replaced the power antenna, the steering box and the rag joint. I also tried and failed to fix the horn and somehow did something that stopped the headlights from rising (they go up with the manual override). Perhaps there is a clue there as what actually happened. Maybe I was focused too much on the overrevving (sp.) and missed another clue? Again, thanks to everyone who offered advice. I tried to thank everyone individually but might have missed someone. Philgran
Drifting
Joined: Jan 2011
Posts: 1,853
Likes: 81
From: Hamilton Virginia
Words I speak on a regular basis.If your engine does start and is not making any sounds, oil pressure is good temps are good you should be ok. The dying could be the ignition module failing, coil, or fuel related.
Thread Starter
Advanced
Joined: May 2016
Posts: 95
Likes: 7
From: Tolland Massachusetts
Overrevving L48
Thank you, I'm looking into other reasons why it quit. Motor looks and sounds OK. Took a couple test drives. Checking out the coil today. Thank goodness the thing didn't quit during the parade. I would have had to ask the guy picking up the horse droppings behind me to push me. No glory there!
Pro
Joined: Mar 2005
Posts: 635
Likes: 118
From: Lakemont, GA
Just to clarify, did your headlights (pop up) stop working after the "event"?
If the engine ran well (no noises, good power etc.) after the over-rev, you may have dodged a bullet on the hard parts. Could you have pulled a vacuum line when the engine torqued over? They get pretty brittle and can crack easily.
My .02,
Start the engine and check the normal parameters, oil pressure, idle speed and timing etc.
Get a mechanics stethoscope and listen for abnormal noises on the heads, if you are not used to what you will hear the biggest thing you are looking for is differences between the two heads.
Change the oil and run it through a coffee filter, look for any sheens or chunks.
We tend to think of the worst possible outcome first, internal engine damage, but there are a lot of other possibilities from a non-routine event. Hopefully it is something simple, these cars do not like parades, they like to move through the air.
Good luck and I hope it is something simple.
If the engine ran well (no noises, good power etc.) after the over-rev, you may have dodged a bullet on the hard parts. Could you have pulled a vacuum line when the engine torqued over? They get pretty brittle and can crack easily.
My .02,
Start the engine and check the normal parameters, oil pressure, idle speed and timing etc.
Get a mechanics stethoscope and listen for abnormal noises on the heads, if you are not used to what you will hear the biggest thing you are looking for is differences between the two heads.
Change the oil and run it through a coffee filter, look for any sheens or chunks.
We tend to think of the worst possible outcome first, internal engine damage, but there are a lot of other possibilities from a non-routine event. Hopefully it is something simple, these cars do not like parades, they like to move through the air.
Good luck and I hope it is something simple.
Melting Slicks
Joined: Mar 2008
Posts: 2,989
Likes: 198
From: Meriden CT
Today , I overrevved my C3 L48. The story, which I will omit, is not pretty. The tach stuck at 7,000 rpm. The car ran perfectly during the parade I was in. I then drove it home, the tach went back to normal, temp was in normal range, oil pressure at 40. It was in the 80s today. As I started to climb the last hill toward home, the car bucked a couple times, power went down and then the engine quit. After about ten minutes, I was able to restart it and Grt it home. Any ideas on what damage I might have done and how to check it out? Thanks, philgran
If it experienced valve float, that will weaken the valve springs. You might not notice the difference until the next time you float the valves, it'll happen at a lower rpm.
Thread Starter
Advanced
Joined: May 2016
Posts: 95
Likes: 7
From: Tolland Massachusetts
Overreving
Just to clarify, did your headlights (pop up) stop working after the "event"?
If the engine ran well (no noises, good power etc.) after the over-rev, you may have dodged a bullet on the hard parts. Could you have pulled a vacuum line when the engine torqued over? They get pretty brittle and can crack easily.
My .02,
Start the engine and check the normal parameters, oil pressure, idle speed and timing etc.
Get a mechanics stethoscope and listen for abnormal noises on the heads, if you are not used to what you will hear the biggest thing you are looking for is differences between the two heads.
Change the oil and run it through a coffee filter, look for any sheens or chunks.
We tend to think of the worst possible outcome first, internal engine damage, but there are a lot of other possibilities from a non-routine event. Hopefully it is something simple, these cars do not like parades, they like to move through the air.
Good luck and I hope it is something simple.
If the engine ran well (no noises, good power etc.) after the over-rev, you may have dodged a bullet on the hard parts. Could you have pulled a vacuum line when the engine torqued over? They get pretty brittle and can crack easily.
My .02,
Start the engine and check the normal parameters, oil pressure, idle speed and timing etc.
Get a mechanics stethoscope and listen for abnormal noises on the heads, if you are not used to what you will hear the biggest thing you are looking for is differences between the two heads.
Change the oil and run it through a coffee filter, look for any sheens or chunks.
We tend to think of the worst possible outcome first, internal engine damage, but there are a lot of other possibilities from a non-routine event. Hopefully it is something simple, these cars do not like parades, they like to move through the air.
Good luck and I hope it is something simple.
I will try the other suggestions tomorrow. Thank you very much for them.
Pro
Joined: Mar 2005
Posts: 635
Likes: 118
From: Lakemont, GA
Yes on the headlights! On the way home, I got caught in a rain storm so when I turned the wipers on, I tried to turn on the lights and immediately noticed they didn't pop up. I had to replace the A/C compressor and drier as well as the steering box and rag joint and thought I might have messed something up and that it was not related to the overrevving. When the lights didn't come up, I reached under the steering column and used the manual override to raise the lights. They came up fine. Is this a clue to something going on due to the overrevving?
I will try the other suggestions tomorrow. Thank you very much for them.
I will try the other suggestions tomorrow. Thank you very much for them.
You may want to go through the system to make sure all hoses are connected and in good shape, there are quite a few of them and they run to a lot of places including under the dash (headlight switch etc.).
I do not know if this was caused by the high revving but it could be causing some of the symptoms that have you nervous.
