Chrysler 400 issues - Engine Troubleshooting


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Chrysler 400 issues

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j2007
New User

Jan 13, 2010, 5:32 PM

Post #1 of 5 (1223 views)

Chrysler 400 issues	Sign In

Hello, I have a 1969 dodge power wagon with a 400 big block from a 72 model truck.
The motor starts and runs decent except for one problem. The #6 cylinder (2nd from the
back on the passenger side) is severely heating the header tube (almost a light orange glow)
and also backfireing a little. The motor is running a holley 4 barrel carb and also electronic ignition.

I initally thought a stuck valve, but removed the valve covers and all appeared to be working normally. I do
not have much experience with these older engines because I am young.

any help would be appreciated

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 14, 2010, 2:41 PM

Post #2 of 5 (1218 views)

Re: Chrysler 400 issues	Sign In

You have a few modifications so I can just toss out a guess. Some Mopars would use a heat riser which is like a choke for usually passenger's exhaust with bi-metal spring and Mopars and others would seize up forcing strange exhaust flow. These were for fast warm ups. If it has one it should turn free (cold engine please) or just force it to be seized in open position.

Haven't seen them in ages but the did stick if equipped and cause issues?? Just a thought??

T

j2007
New User

Jan 14, 2010, 3:41 PM

Post #3 of 5 (1213 views)

Re: Chrysler 400 issues	Sign In

I have aftermarket headers, where would this be located (inside header tube?)I don't see anything like this, I assume it
would route back to the carb right?

thanks

p.s. nice cat!

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 14, 2010, 5:50 PM

Post #4 of 5 (1205 views)

Re: Chrysler 400 issues	Sign In

It would be between header/manifold and the H or Y pipe diverting the warm exhaust to other side to assist in quick atomization (evaporation to a vapor) of incoming fuel which needs turn from a liquid to a vapor in nanoseconds or engine would flood out.

When liquids evaporate they take heat with them not unlike perspiration evaporating from your skin will take heat away from you allowing your body temp to remain a constant even lower than the ambient temps around you. Metal engine parts hold their cold longer and need an assist. Hope that analogy draws a mental picture.

Since you see a glowing pipe it suggests some raw fuel is still burning/combusting further along than intended.

Again - was just trying to find a reason for your observations,

T

RobertI
Novice

Jan 14, 2010, 5:55 PM

Post #5 of 5 (1202 views)

Re: Chrysler 400 issues	Sign In

I had a similar issue with an old Chevy. Double check your plug wires and make sure they are in the correct firing order. That was my problem, I had 2 wires backwards (#5 & #7). Also double check your sparkplug gaps and make sure they are correct.

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