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1989 Ford Festiva Idles fine bogs on acceleration

Tiny
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Sorry for all the work, but this isn't an easy one. You realize that the MAF could be causing this problem too. I didn't realize there was no power to it.
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Wednesday, May 28th, 2014 AT 9:46 AM
Tiny
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No problem, this is a mission now. I was under the impression that the MAF was the issue initially.I replaced the MAF. It was not until I connected the new one that I discovered it immediately stalled the car when I plugged the connector to it. When testing the connector to the MAF (From the repair manual) I checked the voltage.I think it said the voltage was supposed to read 5v with KOEO. I read 0V. If no voltage, says to check FP relay. Dead, I replaced it. That's when I found the FP was hard wired to switched ignition source. The Power relay clicks but I did not remove it. I assumed it was ok. I checked continuity of the connector, OK. Traced a wire (from schematic) from the connector to the test plug for continuity, Ok. Was not sure where to go from there. I was focusing on the Solenoid we have been discussing. Further, thanks again for your help. In appreciation, will I still have the option to provide a donation for your assistance?
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Wednesday, May 28th, 2014 AT 10:03 AM
Tiny
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Honestly, it is up to you. We answer them for free all the time, so don't be concerned.
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Wednesday, May 28th, 2014 AT 10:41 AM
Tiny
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Thanks. Your thoughts on where I should go from here?
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Wednesday, May 28th, 2014 AT 10:45 AM
Tiny
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I think the PCM needs checked.
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Wednesday, May 28th, 2014 AT 10:49 AM
Tiny
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Is pulling the ECM out best for this, or testing at individual plugs for vlotage?
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Wednesday, May 28th, 2014 AT 10:54 AM
Tiny
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I would leave it mounted in the vehicle for this test.
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Wednesday, May 28th, 2014 AT 6:15 PM
Tiny
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I have not tested an ECM before, what exactly am I testing? What type of diagnosing? Anything specific I am looking for? Am I starting with the MAF wire from the connection to the ECM?
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Wednesday, May 28th, 2014 AT 6:44 PM
Tiny
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Basically, you need to first check to see if there are signals to the MAF right at the ECM. There could be a wiring issue between the ECM and the sensor. If you get the same reading at the ECM (0 volts) to the MAF, then I would pull the unit and have it checked. I hate to say it, but on an 89, I can't remember for sure, but I believe you will need special tooling to check it.
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Wednesday, May 28th, 2014 AT 6:56 PM
Tiny
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I will pull the wiring schematic and begin checking wires. It would be cheaper to pickup an ECM at the junk yard. I will let you know if I locate something. It make take sometime, I'ill get back to you.
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Wednesday, May 28th, 2014 AT 7:06 PM
Tiny
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I look forward to hearing from you.
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Thursday, May 29th, 2014 AT 7:04 PM
Tiny
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Sorry it has been awhile, I took my family on vacation. Anyway, using the wiring diagram I traced all of the wires back to the plug at the PCM. All have continuity. I have also checked the TPS its ok. I purchased a new solenoid, the one on the back of the engine. I have not checked voltage yet but after changing it and starting the car it still bogs down when I give it gas. It is confusing that it will idle fine without the MAF connected, but as soon as I connect it, it dies. MI assume I will have to pull the PCM now? I have not checked fuel pressure or the pressure regulator. Any more ideas?

Dan
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Thursday, June 19th, 2014 AT 7:40 PM
Tiny
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Dan:

Good to hear from you. Actually, I'm sitting at the beach right now myself. Lol Leaving tomorrow to go home.

As far as the problem, it may be a good idea to check fuel pump pressure and the regulator.
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Thursday, June 19th, 2014 AT 8:53 PM
Tiny
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Hope you had a cold one for me!

I am going to check the fuel pressure today. However, the 89 Festiva I believe does not have a fuel test port. I have a gauge and I will have to test from the fuel filter, what does the fuel filter adapter look like? Also am I checking the fuel pressure between the Fuel filter and the pressure regulator only, and not after the regulator correct? I looked at your video for "how to check a fuel pump." Should the same principles apply?

Dan
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Friday, June 20th, 2014 AT 7:55 AM
Tiny
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Hay,

Finally home. God that long of a trip with a wife and kids isn't good. Lol

Yes, the same principals will apply. As far as an adapter, you will have to check what kind of connection you have at the filter. Also, I would recommend checking it after the filter in case the filter is plugging.
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Friday, June 20th, 2014 AT 7:56 PM
Tiny
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Ok so check it before and after the filter? Also coincidently I am looking at my huge shop manual. Curious, it talks about an ISC-BPA Valve ad part of the fuel system. What is this? Also, does the VAC Meter or MAF. Have to be dialed in? It says it has a potentiometer. This issue seems like it would be eady to diagnose. I am trying to see what I need. The scrap yard just got an 89 Festival on Tuesday. Id like to grab the PCM or fuel regulator, lol!

Thanks,

Dan
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Friday, June 20th, 2014 AT 8:08 PM
Tiny
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The ISC is easy. Idle speed control valve. It was replaced with what is now called the IAC, Idle air control valve. PCA has me a bit confused. The only time I have even heard that term was when referring to the valve body in the transmission. Does your book reference anything else related to it?
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Saturday, June 21st, 2014 AT 7:35 PM
Tiny
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Did you mean PCM? The manual calls the ECM the PCM. Could the ISC be causing my issue? This is not easy to diagnose.
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Saturday, June 21st, 2014 AT 11:28 PM
Tiny
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I really don't think the ISC would cause the issue you described. Basically it is a valve that allows a metered amount of air into the engine (at idle only). Once you place your foot on the gas and open the throttle body, basically the ISC does nothing.

I hate to say it, but you're right. This is a tough one to diagnose. It's going to put us both in the nut house. Lol I feel really bad that we haven't solved this issue. What makes things even harder is not being there.

Did you get a fuel pressure reading?
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Sunday, June 22nd, 2014 AT 8:58 PM
Tiny
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So, would high fuel pressure cause an issue? I connected the fuel pressure gauge today and just turned on the key and the psi went to 70. I did not do a running test because the hose split.

Oh yeah, remember I said that when I connect the plug to the MAF, it kills the engine while idling? When I do plug it in it shuts the check engine light off.

Your thoughts?

Dan
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Wednesday, June 25th, 2014 AT 6:42 PM

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