Reply With QuoteDo these have a hot spot under the carby? if so maybe it has rusted through .
Regards Philip A
Master
Subscriber
318 Chrysler V8 problems
We have a Dodge AT4 575 truck with a 318 Chrysler V8. At approximately 50°C, or after 5 minutes smooth running without choke, the engine starts to lose speed at idle and misses and pinks. Then, apart from occasionally backfiring, it does not respond to the throttle.
When connecting the vacuum gauge whilst the engine is cold, the vacuum gauge states everything is normal. However, when the engine starts to warm up, the vacuum steadily disappears as if the engine was turned off. Adjusting the ignition timing makes no difference.
We have replaced the vacuum hose to the distributer, the ignition leads and plugs, the ignition coil, and the distributer cap, and the engine still wont run properly at operating temperature.
Does anyone know what may be wrong?
LRT
Swaggie
SubscriberDo these have a hot spot under the carby? if so maybe it has rusted through .
Regards Philip A
Wizard
One thing to check - loose intake manifold bolts &/or manifold gasket expired. Otherwise, you may have a vacuum hose connected the wrong way in the emissions setup (If it even has such stuff ). Make sure the dissy is hooked up to the correct port on the carby ( I've done such a thing myself).
Spraying around carby cleaner at places that are suspect for vacuum leaks also works ( But it has it's hazards....)
RoverLord
Langy is onto it.
Best way to find the problem is with a CRC spray(use the plastic tube) if there is a gasket leak the engine revs will pick up when it sucks the extra fuel (CRC) in.
Only spray small amounts at a time as there is a posibility of ignition of the spray from arcing plug leads.
GOODLUCK
Andrew
DISCOVERY IS TO BE DISOWNED
Midlife Crisis.Im going to get stuck into mine early and ENJOY it.
Snow White MY14 TDV6 D4
Alotta Fagina MY14 CAT 12M Motor Grader
2003 Stacer 525 Sea Master Sport
I made the 1 millionth AULRO post
Master
SubscriberHi PhilipA, the inlet manifold is rusty, but appears to be sound. However, I will check further. Thanks for the advice. LRT
Master
SubscriberHi langy, the vacuum hose is only from the carbureter to the distributer, with no emission system. However, I will check the intake manifold and gasket.
LRT
Master
SubscriberHi LandyAndy, do you remove the air cleaner and spray it down the carby? Or do you just spray it around the manifold? LRT
AT REST
Have a listen to the exhaust as the engine is dying. Maybe there's damage inside the muffler or you may have a faulty heat flap in the exhaust manifold. You would get a hissing noise (Valiant vacuum cleaner noise). Ripping the exhaust off may help.
I assume by your first post that the ignition is electronc as you don't mention points. The chrysler electronic ignition can fail in the same way the Lucas system in the LR systems. In fact I did my Bosch amp conversions on them long before the landies. If it's points your condenser may not like you.
RoverLord
Spray it around the carby base(gasket) then around the intake manifold gaskets where it joins the heads.Originally Posted by LRT
Its the easiest way to find leaking gaskets.
Andrew
DISCOVERY IS TO BE DISOWNED
Midlife Crisis.Im going to get stuck into mine early and ENJOY it.
Snow White MY14 TDV6 D4
Alotta Fagina MY14 CAT 12M Motor Grader
2003 Stacer 525 Sea Master Sport
I made the 1 millionth AULRO post
a 360 2 barrel i worked on had an exhaust port into the intake manifold that has no control valve-im assuming its open at all time and exhaust pressure changes the amount of gases through.
has these engines got a vac hose into the auto choke mechanism.
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