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Ranger: I have 1991 ford ranger is idling rough after warm

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I have 1991 ford ranger...
I have 1991 ford ranger is idling rough after warm up and the tachometer and temperature gauges work but show low readings. I have been working on it for a while. It gives a check engine light and a code 18 and 88. I have made these repairs: new crankshaft position sensor, ignition control module, new coil packs and condensers, new temperature sending units, cleaned all the ground connections.
Submitted: 2 years ago.Category: Ford
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Answered in 19 hours by:
6/9/2015
Ford Mechanic: Pete, Auto Service Technician replied 2 years ago
Pete
Pete, Auto Service Technician
Category: Ford
Satisfied Customers: 29,485
Experience: Over 17 years diagnosing and repairing automobiles various makes and models with some training and certifications.
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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
In some cases this type of fault here is caused by incorrect fuel injectors atomizing improperly.If you can tell me the liter engine in this model here I can further see if we can pinpoint the cause just let me know.
Thanks Pete
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Customer reply replied 2 years ago

I have a 2.3l automatic it starts and runs. It gets up and runs fine when driving. It idles well when cold but runs so rough at idle it feels like it's going to shake the doors open after it warms up.

Ford Mechanic: Pete, Auto Service Technician replied 2 years ago
Code 88 indicates a fault with coil pack #4.Check the wiring and wiring connection to this coil and make sure there is no damage needing repaired to correct this here.Code 18 indicates an ignition circuit open or shorted,this can also be due to engine wiring fault on the engine.Inspect the coil wiring and engine wiring harness for any shorts or damage and if an issue is found repair it as needed.
If this is checked and found o.k. let me know.
Thanks Pete
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Customer reply replied 2 years ago

I only find 2 coil packs. One on the exhaust and one on the intake are these split? I did a visual on the exposed wires and didnt see any damage is there any way to test these without pulling off the heat wrap?

Ford Mechanic: Pete, Auto Service Technician replied 2 years ago
Hi,
I am following up with you to see if you still needed help with your question you had asked.If my help didn't satisfy your question please let me know so we can continue.
Thanks Pete
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Customer reply replied 2 years ago

only find 2 coil packs. One on the exhaust and one on the intake are these split? I did a visual on the exposed wires and didnt see any damage is there any way to test these without pulling off the heat wrap?


Ford Mechanic: Pete, Auto Service Technician replied 2 years ago
I apologize for the delay.
If you wiggle the engine wiring harness at the coils and leading to them while the engine is running poorly does the engine change speed at all or stall out?
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Pete
Pete
Pete, Auto Service Technician
Category: Ford
Satisfied Customers: 29,485
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Experience: Over 17 years diagnosing and repairing automobiles various makes and models with some training and certifications.

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