View Full Version : 51 Commander Epic fail on long test drive

06-18-2018, 04:29 PM
I wish I knew more of the quirks on this car, but this is how you learn. Took her on a 20 mile test drive, city and freeway. Started off well until about 15 miles on the freeway. She was running great at 65-70 mph and then the problems began. She bogged down and would not respond to the accelerator. Very difficult to even get her to 55. (vapor lock or transmission?) Still running original fuel pump. When placed in low had great acceleration. No pickup at all in intermediate gears. Did not really want to downshift well. Died when stopped in drive after she heated up(that is still a transmission adjustment, still working on that), Radiator overflowed through the overflow tube,(still running straight water and 96 today, imagine that has to be major part) Some reason when put in neutral still wanted to move forward(linkage adjustment), gas leaking out of top of tank through fuel sender(new gasket) As you can see much did not go well. At least I got home. Thoughts on some of these. Went to Transmission manual and did not find some of these problems. So looking for ideas from those who know.

06-18-2018, 04:50 PM
I think most of your problems are related to an issue I think was mentioned by a member trying help you, "the High Gear Lockup in the DG-200 Torque Converter is malfunctioning". :(

06-18-2018, 05:00 PM
Yes, I saw that one but was hoping it was the accelerator governor adjustment. Wanted to try a few things first. I was hoping to not tear into the transmission yet. I have a DG 250 that I could put in. Again just did not look forward in going in.

06-18-2018, 05:41 PM
I would limit the car to in town driving. Just driving the car may correct some problems. Bad parts will fail. Start working on the easy problems first. If you haven't done it. Start with basic maintence. Go thru the cooling system. Find someone who can help you on that transmission.

The more you drive it. The more you fix. The better it will be.

Good luck


06-18-2018, 06:40 PM
I went through the cooling system, flush, new top, bottom hose, new 160 thermostat, new rad cap. Water starts to flow at 160-165. Temp difference rad top to bottom is about 25-30 degrees. Only thing I have not done is add coolant. Adjusted transmission linkages again. Need to reseal fuel sender and then will try it out again Tuesday.

T.J. lavallee
06-18-2018, 11:00 PM
When ever doing a "shake down" driving test it's best to stay close to home. If you're in the city or a suburb just drive around the block a few times. Head back to your driveway, lift the hood and check for leaks, ect. If all seems well, drive around a few more blocks then repeat. Going on the interstate is something I avoid during a "shake down" until I'm convinced all systems are functioning properly including the cooling system. Having proper coolant mix is imperative even if you're driving just short distances. Prepping the car before driving it is imperative. Be confident in knowing you have checked all systems before attempting a long drive at sustained highway speeds. Happy motoring!

Mrs K Corbin
06-19-2018, 09:43 AM
I don't consider that Epic. Epic is Towing back home after scattering parts somewhere.

06-19-2018, 10:26 AM
OK, you are right. I have had quite a few drives on other cars where I have had to have them towed back. This one was more disappointing since I have driven the car around the neighborhood several dozen times before without too much trouble.