I bet its the map hose, I used to change those all the time. Also its
important that the egr works right. The egr manipulates the fuel table, if
its plugged the thing will run lean all the time. Vacuum leaks dont really
effect MAP sensor cars, the idle will just increase, a MAF sensor car will
go lean but not a MAP sensor car. That MAP sensor hose is very critical
though. And the MAP sensors do go bad, you can get one off any ford of that
era in the junk yard.
I forgot to mention that the ECM also looks at engine speed which is read
through the distributor pickup and then through the ignition module which
is mounted externally on those. Haha crash course on Ford EEC-IV systems.
I had an 89 Crown Vic and vacuum leaks are going to be one of your big
issues. For whatever reason they thought it was a good idea to use vacuum
controls for the A/C and even the brake lights so a leak will cause all
sorts of things to work strangely. You’ll also want to check that TV
bushing, I’m told they all need to be replaced with a new design, and if it
fails it can totally ruin your transmission.
As far as diagnosis goes, you can check MAP output, TPS voltage, ECM
coolant temp sensor voltage and oxygen sensor voltage/switching with your
digital voltmeter quite easily. Welcome back friend.
I had a friend with a 5.0L mustang that would routinely remove that upper
every few months and clean it out… Those EEC-IV systems are actually
quite easy to troubleshoot and test. Usually the main culprits for
drivability issues seem to be oxygen sensors, map sensors and vacuum leaks.
That’s a “speed density” system which means no Mass air meter. The ECM
decides fuel trim and spark advance based on map voltage(vacuum), coolant
temp, tps(throttle position and then refers
Does the plymouth have the old 318 polysphere (wide block) ??? (I can’t
recall from earlier videos) If it does- could be cracks around the center
water port from the heads to the block. Had a truck 318 poly that was
cracked there on both sides…..no leaks when I tore it down, but I didn’t
use the engine….and cast is hard to fix right…..
coolant into the block on the 318 could be a cracked block or just a failed
intake manifold gasket. The EFI Fords are real picky about their vacuum
lines. Its very simple to actually fix them once you pull the manifold off,
but its just about impossible to work on with the manifold in place. Now is
the time to change those valve cover gaskets if they leak. Use the FelPro
Permadry gaskets and never worry about it again. Check the TV bushing too.
It is really not all that more complex than taking off a carb. It has about
the same number of components connected and serves a similar
function…throttle cables, vacuum lines, bolts and gasket to the lower
intake. It does have some more vacuum lines than the older carb vehicles
and there is also the EGR cooler lines but I was amazed how similar the R&R
process was as to when I have done carbs.
I had the same issue the tps and cs was bad not shure if that engine has
nylon timeing gears so i would ask the ford dealer about that but the tps
is bad because it will barley drive its going into limp home mode so the
car will still go just go slow good luck 302 5.0 is a good engine ps 318
that old needs head gaskets eeasy fix plus since its that far apart u could
get a nice cam in it nice to see u back !
Thank you…this car I think had the manifold off before and had a new
brass bushing on the TV cable when I got it. I haven’t replaced the valve
covers yet as there doesn’t seem to be much oil leakage there but that is a
good idea. I have replaced all of the other bushings on my AOD cars.
Unfortunately I have one Grand Marquis with a destroyed AOD which I got
back in college and I didn’t know about the bushing and the cable got loose.
You do not need to replace the PCV valve just clean it with a little
carburetor cleaner, then just shake it, if it rattles its good, you went
way to far to diagnosis the problem, if you need any help just email me.
There is no vacuum to charcoal canister.
..to lookup tables programmed into the ECM. It sounds like greek but it’s
not. You would quickly understand it after reading through some theory. The
mass air vehicles used an airflow meter to give a better, quicker picture
of engine load. The speed density system works well but is always a “split
second” behind because it has to always go to the look-up tables. Mustangs
got mass-air in 1989 but the other cars did not. Sorry to ramble so much
but I love these systems.
Hi, yes that is a Poly 318, thanks for the suggestions. I do have its
intake manifold off and a complete gasket set so I will see if I can see
any cracks.
){kind=link}
GREAT VIDEO! I AM DOING THE SAME 88 TC I WANT TO ADD A INTAKE.
I bet its the map hose, I used to change those all the time. Also its
important that the egr works right. The egr manipulates the fuel table, if
its plugged the thing will run lean all the time. Vacuum leaks dont really
effect MAP sensor cars, the idle will just increase, a MAF sensor car will
go lean but not a MAP sensor car. That MAP sensor hose is very critical
though. And the MAP sensors do go bad, you can get one off any ford of that
era in the junk yard.
Those MAP sensors did tend to go bad. Also I have replaced TPS sensors for
hesitation problems on older fords
I forgot to mention that the ECM also looks at engine speed which is read
through the distributor pickup and then through the ignition module which
is mounted externally on those. Haha crash course on Ford EEC-IV systems.
Welcome back Chad. Its good to see you here. Read any good books lately?
:):)
The can is a vacuum reservoir for the climate control system.
I had an 89 Crown Vic and vacuum leaks are going to be one of your big
issues. For whatever reason they thought it was a good idea to use vacuum
controls for the A/C and even the brake lights so a leak will cause all
sorts of things to work strangely. You’ll also want to check that TV
bushing, I’m told they all need to be replaced with a new design, and if it
fails it can totally ruin your transmission.
As far as diagnosis goes, you can check MAP output, TPS voltage, ECM
coolant temp sensor voltage and oxygen sensor voltage/switching with your
digital voltmeter quite easily. Welcome back friend.
I had a friend with a 5.0L mustang that would routinely remove that upper
every few months and clean it out… Those EEC-IV systems are actually
quite easy to troubleshoot and test. Usually the main culprits for
drivability issues seem to be oxygen sensors, map sensors and vacuum leaks.
That’s a “speed density” system which means no Mass air meter. The ECM
decides fuel trim and spark advance based on map voltage(vacuum), coolant
temp, tps(throttle position and then refers
Does the plymouth have the old 318 polysphere (wide block) ??? (I can’t
recall from earlier videos) If it does- could be cracks around the center
water port from the heads to the block. Had a truck 318 poly that was
cracked there on both sides…..no leaks when I tore it down, but I didn’t
use the engine….and cast is hard to fix right…..
Glad to see a new video. It’s a shame some auto repair shops won’t do what
it takes to do the job right.
Hope it runs great when your done.
★★★★★ Love the old car videos! Nice to see you keeping the old gems on the
road! I’d sure like to see more videos on them.
coolant into the block on the 318 could be a cracked block or just a failed
intake manifold gasket. The EFI Fords are real picky about their vacuum
lines. Its very simple to actually fix them once you pull the manifold off,
but its just about impossible to work on with the manifold in place. Now is
the time to change those valve cover gaskets if they leak. Use the FelPro
Permadry gaskets and never worry about it again. Check the TV bushing too.
Nice cars! Much nicer than those we had here in the UK.
It is really not all that more complex than taking off a carb. It has about
the same number of components connected and serves a similar
function…throttle cables, vacuum lines, bolts and gasket to the lower
intake. It does have some more vacuum lines than the older carb vehicles
and there is also the EGR cooler lines but I was amazed how similar the R&R
process was as to when I have done carbs.
I had the same issue the tps and cs was bad not shure if that engine has
nylon timeing gears so i would ask the ford dealer about that but the tps
is bad because it will barley drive its going into limp home mode so the
car will still go just go slow good luck 302 5.0 is a good engine ps 318
that old needs head gaskets eeasy fix plus since its that far apart u could
get a nice cam in it nice to see u back !
Glad to see you posting again. Hope to see more videos from you. Always
learned something from your electronics repair sessions.
What is that tin can for?
Thank you…this car I think had the manifold off before and had a new
brass bushing on the TV cable when I got it. I haven’t replaced the valve
covers yet as there doesn’t seem to be much oil leakage there but that is a
good idea. I have replaced all of the other bushings on my AOD cars.
Unfortunately I have one Grand Marquis with a destroyed AOD which I got
back in college and I didn’t know about the bushing and the cable got loose.
Great work dude, let us know how it all turns out for this project.
Great to see you back!
that sucks, lol
You do not need to replace the PCV valve just clean it with a little
carburetor cleaner, then just shake it, if it rattles its good, you went
way to far to diagnosis the problem, if you need any help just email me.
There is no vacuum to charcoal canister.
More automotive videos please Chad. Glad you are back.
..to lookup tables programmed into the ECM. It sounds like greek but it’s
not. You would quickly understand it after reading through some theory. The
mass air vehicles used an airflow meter to give a better, quicker picture
of engine load. The speed density system works well but is always a “split
second” behind because it has to always go to the look-up tables. Mustangs
got mass-air in 1989 but the other cars did not. Sorry to ramble so much
but I love these systems.
Hi, yes that is a Poly 318, thanks for the suggestions. I do have its
intake manifold off and a complete gasket set so I will see if I can see
any cracks.