Ok I got the New ECM in it and the engine runs great!! one small problem one of pitsons is getting to hot what could be causing that? its the only real problem left in this engin swap its a 1985 v6 engine

Tammy

A lean fuel mixture will increase temps, as will a coolant problem (collapsed hose or kinked tube, water pump going south). How do you know one of the pistons is hot?.........Paul

you can look at it and tell its hot it gets cherry red

Hmmm... have to ask: How do you know that a piston is getting too hot (e.g. - from examining spark plugs?) ? Do you know which one it is?

------------------

quote Originally posted by TamsDrums: you can look at it and tell its hot it gets cherry red

You mean the exhaust manifold for one piston glows red?. If so I would say there is a fuel, coolant or timing problem.....Paul

Yea the manifold sorry i'm relaying information We will check that out and see if that helps hope it does i'm wanting my car back

tammy

quote Originally posted by TamsDrums: Also found out its the number 6 cylander the manifold gets red hot right on no 6. tammy

I would first check the timing (A and B shorted and set #1 to 10* BTDC), I would also verify that the coolant temp was within specs (mechanical guuge), then I would check fuel pressure at the test port on the fuel rail, (should be 40psi key on, engine off and hold that number for several minutes). Just for grins, I would also check the plug wires are on the right cylinders
Is the idle is OK, that is, it is not high indicating a vaccum leak?

If all this checks out I would say the #6 injector is bad or the wiring to it is bad, or there may be a small vacumm leak in one of the manifolds at #6. That's all I can think of. I would not think it is ECM related, but did you have this problem before you installed the new ECM?.............Paul

Usualy a glowing manifold is a vacum leak or bad timing. Id check for vac leaks first

Not saying it's not a leak, but would think it would affect more than one Cyl. if it was vac.

I agree more that it's timing or more likely fuel related to that Cyl.

quote Originally posted by Dodgerunner: Not saying it's not a leak, but would think it would affect more than one Cyl. if it was vac. I agree more that it's timing or more likely fuel related to that Cyl.

I agree, but it could be a small leak in the lower/intermediate manifold(s) that feed #6, at least it's possible. It could also be that injector #6 is leaking air around the "O" ring or the injector is not seated properly...Paul

if only one cyl is hot I think a lean state from a partly blocked injector
as timing or vacume leak would not be one cyl only

get a new or used injector or have the bad one cleaned by a pro

------------------
Question wonder and be wierd
are you kind?

Well this is a puzzle we swaped out injectors thinking it would do the same thing if put in another spot and manifold is still getting hot at the no 6 spot so thanks for all the help we just have a real puzzler on our hands

Tammy

OK, been thinking about this. Other than a leak on the intake for #6.

When you say you have changed injectors, did you change all, or just #6.

Just a wild idea, compare the resistance of the injector curcuits even vs odd cyl's.

IE check the pair that runs 1-3-5 and compare to 2-4-6. See if they read about the same. If you did not change all the injectors, could it be 2 0r 4 is bad and the result is showing up on #6?

Just another idea.

DR

quote Originally posted by TamsDrums: you can look at it and tell its hot it gets cherry red

I'm glad you cleared that up. Now let me put my font size back to normal.....

Just a stab, here, but easy to check - is it possible that one (or both) exhaust manifold bolts on #6 is broken or missing? Thinking that, only because I had both of the #6 bolts broken on a particular Fiero one time).

Unlikely but possible, and it's easy to check.

I know this sounds crazy, but swap number 6 plug with another one a see what happens. If a plugs get too hot then the cyl will run hot.
Don

quote Originally posted by ka4nkf: I know this sounds crazy, but swap number 6 plug with another one a see what happens. If a plugs get too hot then the cyl will run hot. Don

Tried that that wasn't it But its so weird the engine runs great its just that one little problem with it no missing or anythign just that manifold problem

tammy

Ok,
Timing and fuel pressure regulator seem to be ok or the problem would be with all of them.

You’ve moved the injector to a different spot but the glow stayed at #6.

You’ve moved the spark plug to a different spot but the glow stayed at #6.

Our engines are not sequentially injected. One whole side sprays at one time.
Try swapping the electrical connectors between #6 and #4 injectors.
This will rule out an injector wire problem.

As many have said you could have a vacuum leak on the lower manifold or around the injector.
You can spray WD-40, brake cleaner, PB blaster, starting fluid, just about anything around suspected vacuum leaks and it will make the engine change RPM when you get to it. I use a propane torch WITHOUT LIGHTING IT to find vacuum leaks, it’s not so messy to clean up.

Isn’t the cold start injector closest to #6 intake runner?

After that I would do a compression test to see if the exhaust valve was sealing.

good luck

[This message has been edited by buddycraigg (edited 10-23-2005).]

pulled from this thread
https://www.fiero.nl/forum/Forum2/HTML/068010.html

quote Originally posted by TamsDrums: Ok this is what we did to fix my v6 problem with its flooding and hotspot problems. 1st replaced the ECM 2nd. replaced oxygen sensor 3rd. replaced all six injectors 4th. replaced the gaskets on the manifold. this fixed 90 percent of what was wrong we then had to replace the fuel injection harness once we took care of these above things it fixed our flooding problem and the replacement of hte fuel injection electrical harness took care of the hot spot in the no 6 manifold Thanks to all who helped Tammy