68HemiCharger
Member
Ok. I have several issues with this 426 Hemi in my 1968 Charger. Engine is stock.
When I first got the car it was very hard to start when cold and the timing was too far advanced and would idle at 1800 rpm and then drop to below 500 in gear want to die.. Absolutely horrendous. I set the timing to TDC as it says on the decal on the fender, got the idle speed set to 750 and it idles good and doesn't drop in rpm when going into gear.
However the car now diesels when shutting off the ignition when in park. Won't do it when in drive. I'm running 93 octane with octane booster. Its also still very hard to start when cold.
Another issue is if I give it gas when in park the idle speed will go up to 1800 rpm and stay there or even increase on its own to above 2000 rpm. Kinda scary. The throttle return springs are good and the throttle is back down on the idle stop screws even as this is happening. It will eventually go back down by itself, or if not, if I start backing off on the idle screws itll come back down but then i have to turn the screws back in to idle at 750 to keep it running. Makes me think something may be wrong with the vacuum advance? When I disconnected the vacuum line to set the timing I had no change. Wondering if when I give it throttle the vacuum advance is stuck and increasing the rpm?
I have very limited knowledge and experience with setting timing. And am very confused by a lot of it.
Any help is greatly appreciated. If anyone knows of a good Hemi tuning guy in southeast Michigan that'd be helpful too.. but I'd definitely like to attempt fixing it myself.
When I first got the car it was very hard to start when cold and the timing was too far advanced and would idle at 1800 rpm and then drop to below 500 in gear want to die.. Absolutely horrendous. I set the timing to TDC as it says on the decal on the fender, got the idle speed set to 750 and it idles good and doesn't drop in rpm when going into gear.
However the car now diesels when shutting off the ignition when in park. Won't do it when in drive. I'm running 93 octane with octane booster. Its also still very hard to start when cold.
Another issue is if I give it gas when in park the idle speed will go up to 1800 rpm and stay there or even increase on its own to above 2000 rpm. Kinda scary. The throttle return springs are good and the throttle is back down on the idle stop screws even as this is happening. It will eventually go back down by itself, or if not, if I start backing off on the idle screws itll come back down but then i have to turn the screws back in to idle at 750 to keep it running. Makes me think something may be wrong with the vacuum advance? When I disconnected the vacuum line to set the timing I had no change. Wondering if when I give it throttle the vacuum advance is stuck and increasing the rpm?
I have very limited knowledge and experience with setting timing. And am very confused by a lot of it.
Any help is greatly appreciated. If anyone knows of a good Hemi tuning guy in southeast Michigan that'd be helpful too.. but I'd definitely like to attempt fixing it myself.