Mark: While I do not have the magical cure to your problem, I can comment on my personal findings with my '67 Imperial heat riser. (The heat riser discussion went back and forth a few weeks ago) I have dual exhausts and can confirm the following (on my car) - looking at the heat riser from the passenger fender, turning it clockwise (top of riser forward) is open, turning it counter-clockwise (top of riser backward) is closed. My heat riser IS missing the spring and possibly the counter weight but, I can confirm open and closed (with engine running) because of the VERY noticeable change in exhaust volume and noise out of the passenger side exhaust pipe. Possibly your hard start when warm problem has to do with vapor lock? The heat riser in the wrong position would certainly heat up the manifold and consequently the fuel supply. Just some thoughts. Dan Richardson 300L Family Heirloom -------------- Original message ---------------------- From: serge brassard <300mtrex@xxxxxxxxxxxx> > I had the same trouble (very unpleasant > )and did a lot of things including what you did. > Finally I resolve 100% the trouble with; changing the valley pan (intake > manifold) with Fel Pro no.1215 this gasket block the manifold heat crossover > and putting a aluminium intake.Whenever the engine is hot or cold it start the > same at once I turn the key.........fantastic.The only thing that I don't know > is what happen if only the valley pan would be changed > Hoping that it willl help you good luck and excuse my english. > Serge > ----- Original Message ----- > From: Mark Pappas > To: mailing-list@xxxxxxxxxxxxxxxx > Sent: Tuesday, September 11, 2007 5:31 AM > Subject: Re: IML: help > > > Perhaps the ignition coil is faulty once it gets hot..... > On Sep 10, 2007, at 6:52 PM, Greg Krueger wrote: > > > After my 68 imperial has warmed up from running about 15 minutes it > occasionally will not start for about 20 minutes. I have done a lot of work to > try to fix this. I removed the intake manifold, replaced the valley pan and > painted the manifold. I installed a spacer between the carb and adjusted the > floats in the carb. I checked the heat riser, it is broken and laying in what i > assume is the open position, all the way back and it does not move when i rev > the engine. Also the heat running through the manifold exhaust port makes the > manifold so hot it discolored my engine paint job! I checked and the exhaust > ports in the heads and manifold are free and clear of obstruction . I do not > know what to do now! please help > Make your little one a shining star! Shine on!
--- Begin Message ---
- From: serge brassard <300mtrex@xxxxxxxxxxxx>
- Date: Tue, 11 Sep 2007 12:20:56 +0000
On Sep 10, 2007, at 6:52 PM, Greg Krueger wrote:
After my 68 imperial has warmed up from running about 15 minutes it occasionally will not start for about 20 minutes. I have done a lot of work to try to fix this. I removed the intake manifold, replaced the valley pan and painted the manifold. I installed a spacer between the carb and adjusted the floats in the carb. I checked the heat riser, it is broken and laying in what i assume is the open position, all the way back and it does not move when i rev the engine. Also the heat running through the manifold exhaust port makes the manifold so hot it discolored my engine paint job! I checked and the exhaust ports in the heads and manifold are free and clear of obstruction . I do not know what to do now! please help
Make your little one a shining star! Shine on!
--- End Message ---
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