fuel system troubles

yep sure can how a map sensor it can set a rich condition and not set a
code
check the vacumm to it so can a 02 sensor but i would remove the fuel
injectors and rail and then power up system and look for leakage of a
injector
i don't remember was the compressoin on that cylinder good ?what did the
plug look like after being in that cylinder? and firing was it wet? was it
coated with carbon?was it new looking ?but wet?

 

i'm not saying it can't happen, a rich condition but i have never seen that
with a failing pump
it has always been a lean condition with a failing pump

 

Just because you get a fault code for a particular part does not mean that
part is bad. If you have a fault code for a map sensor/TPS sensor or
anything else does not mean those parts are at fault. It simply points you
into a direction of the problem. A fuel system rich or lean does not condemn
the fuel pump but points you in the direction of the problem. NO THERE IS
NOT a fault code that simply says fuel pump is bad. Just like there is no
fault code that says 02 sensor, TPS MAP and so on are bad....

Glenn Beasley
Chrysler Tech

 

Just because you get a fault code for a particular part does not mean that
part is bad. If you have a fault code for a map sensor/TPS sensor or
anything else does not mean those parts are at fault. It simply points you
into a direction of the problem. A fuel system rich or lean does not condemn
the fuel pump but points you in the direction of the problem. NO THERE IS
NOT a fault code that simply says fuel pump is bad. Just like there is no
fault code that says 02 sensor, TPS MAP and so on are bad....

Glenn Beasley
Chrysler Tech

 

That is correct. That's why I have a full factory service manual for
each of my vehicles and who knows how many dollars worth of tools and
diagnostic equipment. And if you're wondering if you have a fuel
pressure problem on a 96-99 minivan, your best diagnostic tool is a
fuel pressure gauge 'cause your vehicle's computer simply won't tell
you.

 

First of all, I'm trying to learn something here, rather than just
taking my van to an "expert". I'll admit that I have a lot to learn in
life, and I'm not scared of car maintenance. So you can take your
arrogant attitude somewhere else. If you can help, that's great because
that's why we're all here.

How does the computer know there is a misfire? Does it read the
activity of the coils? I know my engine is misfiring because it has
poor power and will not idle. I also know that the ignition system is
not misfiring because I pulled the wires off the plugs and watched the
sparks jump to the spark plugs. So I'm assuming there wouldn't be a
misfire code anyway.

What would be helpful is to know what other conditions might cause
excessively rich running without setting a code. I looked for vacuum
leaks but didn't find any. Any other suggestions?

 

Has the compression been checked on the cylinder in question?

 

No, it hasn't.

Here's a bit of additional info, which I realized I hadn't covered yet.
I only recently acquired this van, and I did some basic maintenance to
it such as the belt and the plugs and wires. When I pulled the plugs
they all had gasoline on them, not just the #2 and #4 that I mentioned
before. The only difference between these two and the rest is that
when I pull the wires off of them there is no change in the engine,
meaning that they are not producing any power. The rest, although too
rich, are contributing to the engine's power, which is shown by a drop
in performance when I pull the wires.

This is why I became suspicious about the fuel delivery system. But it
seems like more of a universal problem rather than something having to
do with 2 and 4, because they all are wet with gasoline.

 

You need to learn to read, dipshit.

 

You are correct, they normally fail for a lean condition. But, as you
say, I wasn't gonna say it can't happen, so I included it as a
possibility.

 

You can't learn if you don't read.

Speaking of arrogant. There you go assuming things again. Just
because you see a spark doesn't mean the ignition system is working
properly.

The PCM looks for changes in crankshaft speed to determine if there is
a misfire.

Nope, same suggestion.

 

Unfortunately, manuals and diagnostic equipment don't fix cars. In the
wrong hands they're useless, Dipshit.

 

Been there, done that, about 45 years ago. And you?

 

Exactly. That's why I bought mine instead of taking my cars to you. In
typical usenet fashion, you can't or won't refute someone else's facts
so you resort to name-calling. I'd kill-file you if it weren't so
entertaining.

Robert, if you're still there, check your fuel pressure with a good
gauge. If it's good, then you've eliminated a potential cause. If it
isn't, then you've found the culprit.

 

I told you exactly what would or wouldn't set a code, and what code
would be set. Go back and read it again. If you still can't grasp it,
tell me what you're having trouble understanding and I'll type it
slower for you.

Or just kill file me and quit your whining.

 

do a cylinder balance test on those injectors then the rest of them
for confirmation