Mechanics

WHY DOES MY CAR START/STALL UNLESS I AM GIVING IT GAS AFTER I CHANGED MY MANIFOLD?

1997 Ford Mustang • 200,000 miles

I have just replaced my intake manifold on my '97 Mustang & I now have the following symptoms:
Low Idle
Start/Stall
Temp Gauge now working
Overheating
A/c not working
What am I supposed to do? I read none forum that said I could have a pinched wire; but I do not see how or where this could happen. I have the free hanging plenum & no wires run through the manifold area itself. Any help would be greatly appreciated. All I wanna do is get her back on the road properly.
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Mustang_Freeq
June 16, 2012.



I have checked for trouble codes & it read my sensors; which is why I changed them, as well as vacuum leak which is why I hunted them down and fixed them. Probably wouldn't be ab bad idea to clean IAC valve either. Huh? Now, please explain to me exactly what the throttle body is. Is that the piece underneath the manifold; because I was hoping not to take that out again.


Tiny
Mustang_Freeq
Jun 17, 2012.
Throttle body is the part that the accelerator cable is attached to. The barrel has a plate that closes fully when engine is idling but it would still allow a minimal amount of air past it. When the barrel gets dirty, this minimal amount of air is reduced and this would result in lower than expected idling.

It need not be removed for cleaning as carb cleaner works fine but if it can be removed, that would be ideal.

The IAC motor is mounted on top of the throttle body. It allows air to pass through and amount varies according to engine temperature and is computer controlled. Carb cleaner into the air passage would help to clean it. You must not submerge the throttle body and IAC while cleaning as it can damage the TPS and IAC motor.

What were the trouble codes you have and after replacement of the components concerned, are they still there?

What ever information that you have, you should provide it for me so that I can understand the problem better.

The carb cleaner can also be used to test for vacuum leakages


KHLow2008
Jun 17, 2012.
The codes read that I need to change my sensors; I have done this (multiple times actually). OK; what you just gave me might explain my low idle; but it does not explain why my a/c & temp gauge don't work. Keep in mind that all this quit IMMEDIATELY after I changed my manifold. Do you see why I still keep going to back to the wiring issue?


Tiny
Mustang_Freeq
Jun 22, 2012.
Codes DO NOT tell you to change sensors. They only identify a faulty circuit. If the fault code keeps coming back even after you have replace the component, then you need to be performing testings on the wiring circuit or the control unit.

You keep going back to the wiring issue but I am not interested in what people thinks and possibilities. What I want is information that would make me understand what could be wrong and provide a solution. I sent out test for you, did you do them?

Are you familiar with electrical testing procedures and methods?

Those things quit immediately after the repairs indicates something was not correctly installed or had been missed out and it could possibly be a pinched wire but pinched wires would blow out fuses and you said the fuses are good. They do not make sense.


KHLow2008
Jun 22, 2012.
I do know enough to know that a pinched wire will NOT ALWAYS blow the fuses. & To answer your question; No, I am not familiar with electrical testing procedures. I am just getting ready to put it in the shop. I came on here to get a simple answer; which at first was misunderstood. The fact of the matter is that everyone that has looked at this car &/or been explained the issues all go to the pinched wire; except you guys. Two of those were ASE Certified Master Mechanics w/ The FORD spec. I am not trying to say you are wrong; but I would like for you to exp[lain how three things all go bad at the same time & it not be in the wiring.


Tiny
Mustang_Freeq
Jun 23, 2012.
Remember something, we are working blind here trying to help based on info that you are giving us. We all know what we are doing but without seeing the vehicle, we cannot for certain tell you much about what you did. The odds of those sensors failing all at once is not likley at all.

All the info from us guys is right on but your lack of understanding has it at a standstill. You are right to get a shop to look at it as they have it in front of them and can determine the failure for you.
Wish I was more help but I bet it is something simple here but a tech will have to look at it and find the issue.
Roy


ASEMaster6371
Jun 23, 2012.
If wires had not been plugged in correctly they would not work. The fans are related to the temperature gauge as the coolant sensors are also the catalyst for them. You need to start with one and continue from there. Solving one problem might get everything else working.

It is in the wiring but I need you to perform test to understand what is missing or wrong and you keep questioning my queries.

If you want us to help you solve the problem, you need to cooperate as Roy mentioned, we are working blind.

If you want possibilities, it can take a whole day to write all of them, that is the reason I don't want to go into them because it is not going to solve the problem.

If 2 ASE certified technicians are not able to come up with anything, what makes you think the shop you are sendding it to can help you?


KHLow2008
Jun 23, 2012.
These 2 ASE mechanics only looked at it. They did not work on it; or even try to. They tried to tell me what to do. Here's the thing, If I knew what to do, I would've done it. If I knew how to do what they were asking I would've done it. If I knew how to do the tests ya'll are asking me to, I would've done them. I know general car repairs & GENERAL troubleshooting. After that. I am at a loss as to what to do. I do thank you guys for all your help; but at this point, I am confused!


Tiny
Mustang_Freeq
Jun 24, 2012.
These guys had a look and gave their opinions and not diagnostic results without even trying to do anything but you are holding them to be true. We are trying our best to find out the cause of the problem and yet you keep avoiding what we are requesting. If you are doubting our ability to help you then you are at the wrong place.

I never like to keep anything hanging and always try to get to the bottom of the problem until I come to a conclusion, which is near if you continue this way.

If there is anything that you do not understand you must ask and let us know. There is no point for us to tell you what to do and you keeping quiet. That is the cause of all this communiction problem.

We don't have the vehicle here so you are the one responsible for getting us the necessary information to carry on. We can't be dwelling on possibiloities without checking through them.

Pinched wires do not necessarily blow fuses but it would cause something to work wrong as there would be shorting and gauges etc would go out of range.

The other thing that can cause this is disconnected components, wire harnesses, broken wires and wrongly plugged in connectors.

You are confused because you are not listening. Forget everything that has occurred and we start all over from here.

I told you to test the temperature gauge which is a simple job. Find the sending unit wire and ground it. Turn ignition on and if gauge goes to max, the wiring for this circuit.

That is the first test you need to do and what we would start with.


KHLow2008
Jun 24, 2012.
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