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1995 lincoln town car: the car runs..runs rough..accelerating..misfire

Answered by:Eric
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Customer Question

i have a 1995 lincoln towncar. the "check engine" light just came on suddenly yesterday and the car runs rough and upon accelerating the car tries to misfire and acts like it wants to backfire through the maniflod. the car ran perfectly the day before. what happened?

Optional Information:
1995 Lincoln towncar

Submitted: 1988 days and 6 hours ago.

Category: Car

Value: $30

Status: CLOSED

Expert: Eric replied 1988 days and 6 hours ago.

Hi,

The first thing that needs to be done is to read the codes in the computer that is causing check engine light to come on. This is most likely related to running rough. There a many things that can cause this problem, so instead of guessing as to problem and throwing parts and money at it, read the computer and go from there.

Here are directions on how to pull the codes yourself and what they mean:

Ford

111	System PASS.
112	ACT sensor circuit grounded.
113	ACT sensor circuit open.
114	ACT sensor is out of Self-Test.
116	ECT sensor is out of Self-Test.
117	ECT sensor circuit grounded.
118	ECT sensor circuit open.
121	TP sensor is out of Self-Test.
122	TP sensor input is less than Self-Test minimum.
123	TP sensor input is greater than Self-Test maximum.
124	TP sensor input voltage is greater than expected.
125	TP sensor input voltage is less than expected.
128	MAP vacuum hose damaged or disconnected.
129	Insufficient MAF input.
136	HEGO sensor circuit indicates system lean (Right HEGO).
137	HEGO sensor circuit indicates system rich (Right HEGO).
139	No HEGO switching (Front Side).
141	Fuel system indicates lean.
144	No HEGO switching (Left Side).
157	MAF sensor circuit open.
158	MAF sensor shorted to power.
159	MAF sensor is out of Self-Test.
167	Insufficient TP input change.
171	Lack of HEGO switching (Rear Side).
172	HEGO sensor circuit indicates lean. (Rear Side).
173	HEGO sensor circuit indicates rich. (Rear Side).
174	Check for diluted engine oil.
175	Lack of HEGO switching (Front Side).
176	HEGO sensor circuit indicates lean. (Front Side).
177	HEGO sensor circuit indicates rich. (Front Side).
178	Check for diluted engine oil.
179	Fuel system at part throttle lean adaptive limit, system rich (Rear Side).
181	Fuel system at part throttle rich adaptive limit, system lean (Rear Side).
182	Fuel system at idle lean adaptive limit, system rich (Rear Side).
183	Fuel system at idle rich adaptive limit, system lean (Rear Side).
184	MAF sensor input voltage is greater than expected, in range.
185	MAF sensor input voltage is less than expected, in range.
186	Closed loop injector pulse width longer than expected.
187	Closed loop injector pulse width shorter than expected.
188	Fuel system at part throttle lean adaptive limit, system rich (Front Side).
189	Fuel system at part throttle rich adaptive limit, system lean (Front Side).
193	Flexible Fuel sensor circuit failure.
211	PIP circuit failure.
212	Loss of tachometer/IDM input.
213	EEC SPOUT circuit open.
214	CID circuit failure.
215	PCM detected coil 1 primary circuit failure.
216	PCM detected coil 2 primary circuit failure.
217	PCM detected coil 3 primary circuit failure.
218	Loss of ignition diagnostic monitor signal-left side.
219	Spark timing defaulted to 10 degrees, spark output circuit open.
221	Spark timing error.
222	Loss of ignition diagnostic monitor signal-right side.
223	Loss of dual plug inhibit control.
224	PCM detected coil 1, 2, 3 or 4 primary circuit failure.
225	Knock not sensed during dynamic response test KOER.
226	Ignition diagnostic monitor signal not received.
232	PCM detected coil 1, 2, 3 or 4 primary circuit failure.
238	PCM detected coil 4 primary circuit failure.
241	Ignition control module to PCM ignition diagnostic monitor pulse width transmission error.
244	Cylinder Identification circuit fault present when cylinder balance test requested.
311	Secondary air injection system inoperative during KOER self-test (bank #1).
312	Secondary air injection system misdirected during KOER self-test.
313	Secondary air injection system not bypassed during KOER self-test.
314	Secondary air injection system inoperative during KOER self-test (bank #2)
326	PFE sensor circuit voltage lower than expected.
327	PFE sensor circuit voltage below Self-Test minimum.
328	Exhaust gas recirculation valve position sensor closed voltage lower than expected.
332	Insufficient EGR flow.
334	Exhaust gas recirculation valve position sensor closed voltage higher than expected.
335	PFE sensor circuit voltage out of Self-Test range.
336	PFE sensor circuit voltage higher than expected.
337	PFE sensor circuit voltage above Self-Test maximum.
338	Engine coolant temperature lower than expected (thermostat test).
339	Engine coolant temperature higher than expected (thermostat test).
341	Octane adjust service pin open.
381	Frequent A/C clutch cycling.
411	Cannot control RPM during KOER low RPM check.
412	Cannot control RPM during KOER high RPM check.
415	Idle Air Control system at maximum adaptive lower limit.
416	Idle Air Control system at upper adaptive learning limit.
452	Insufficient input from VSS.
453	Servo leaking down.
454	Servo leaking.
455	Insufficient RPM increase.
456	Insufficient RPM decrease.
457	Speed control command switch(s) circuit not functioning.
458	Speed control command switch(s) stuck/circuit grounded.
459	Speed control ground circuit open.
511	ROM test failure.
512	KAM test failure.
513	EEC internal voltage failure.
519	PSPS circuit open.
521	PSPS circuit did not change.
522	Vehicle not in PARK or NEUTRAL during KOEO.
525	Indicates vehicle in gear or A/C "ON" during self-test.
527	Park/Neutral Position switch circuit open or A/C on KOEO self-test.
528	Clutch Pedal Position switch circuit failure.
529	Data Communication Link or PCM circuit failure.
532	Cluster Control Assembly circuit failure.
533	Data Communication Link or Electronic Instrument Cluster circuit failure.
536	Brake On/Off circuit failure/not activated during KOER.
538	Insufficient RPM change during KOER Dynamic Response Test.
539	A/C or defrost "ON" during Self-Test.
542	Fuel pump circuit open, EEC processor to motor ground.
543	Fuel pump circuit open, battery to EEC processor.
551	Idle Air Control circuit failure during KOEO self-test.
552	Secondary Air Injection Bypass circuit failure during KOEO self-test.
553	Secondary Air Injection Diverter circuit failure during KOEO self-test.
554	Fuel Pressure Regulator Control circuit failure.
556	Fuel pump circuit failure.
557	Low speed fuel pump primary circuit failure.
	Electronic Vacuum regulator circuit failure.
559	Air Conditioning On relay circuit failure during KOEO self-test.
562	Pusher fan control primary circuit failure.
563	High speed Electro Drive Fan circuit failure.
564	Electro Drive Fan circuit failure
565	Canister purge (CANP) circuit failure.
566	3-4 shift solenoid circuit failure during KOEO self-test.
567	Speed Control Vent (SCVNT) circuit failure.
568	Speed Control Vacuum (SCVAC) circuit failure.
569	Auxiliary Canister Purge circuit failure during KOEO self-test.
571	EGR Atmospheric (EGRA) solenoid circuit failure during KOEO self-test.
572	EGR Vacuum (EGRV) solenoid circuit failure during KOEO self-test.
578	A/C pressure sensor circuit shorted.
579	Insufficient A/C pressure change.
581	"Power to Fan" circuit over current.
582	Fan circuit open.
583	Power to Fuel pump over current.
584	Variable Control Relay Module (VCRM) power ground circuit open (VCRM Pin 1).
585	Power to A/C clutch over current.
586	A/C clutch circuit open.
587	Variable Control Relay Module communication failure.
593	Heated Oxygen Sensor (HO2S) heater circuit failure.
617	1-2 shift error.
618	2-3 shift error.
619	3-4 shift error.
621	Shift solenoid #1 circuit failure.
622	Shift solenoid #2 circuit failure.
623	Transmission Control Indicator Light circuit failure.
624	EPC solenoid or driver failure.
625	EPC solenoid driver open in EEC processor.
626	Coast Clutch Solenoid (CCS) circuit failure during KOEO self-test.
627	Torque Converter Clutch solenoid circuit failure.
628	Lock-up solenoid circuit failure, excessive clutch slippage.
629	Lock-up solenoid circuit failure.
631	Transmission Control Indicator Lamp circuit failure during KOEO self-test.
632	Transmission Control Switch circuit did not change states during KOER self-test.
633	4x4 Light switch closed during KOEO self-test.
634	MLP sensor voltage out of Self-Test range.
636	Transmission oil temperature sensor voltage out of Self-Test range.
637	Transmission oil temperature sensor voltage above Self-Test maximum.
638	Transmission oil temperature sensor voltage below Self-Test minimum.
639	Insufficient input from turbine speed sensor.
641	Shift solenoid #3 circuit failure.
643	Torque Converter Clutch circuit failure.
645	Incorrect gear ratio obtained for first gear.
646	Incorrect gear ratio obtained for second gear.
647	Incorrect gear ratio obtained for third gear.
648	Incorrect gear ratio obtained for fourth gear.
649	EPC range failure.
651	EPC circuit failure.
652	Torque Converter Clutch solenoid circuit failure.
653	Transmission Control Switch did not change states during KOER self-test.
654	Transmission Range sensor not indicating "PARK" during KOEO self-test.
656	Torque Converter Clutch continuous slip error.
657	Transmission over temperature condition occurred.
659	High vehicle speed in park indicated.
667	Transmission Range sensor circuit voltage below minimum voltage.
668	Transmission Range circuit voltage above maximum voltage.
675	Transmission Range sensor circuit voltage out of range. Hard fault present, vehicle is in Failure Mode Effects Management (FMEM).
998	Hard faults present.

To extract DTCs from the computer for diagnostic purposes, the Self Test connector is used. The DLC is located below the instument panel to the right of the steering wheel.

Start engine and bring to normal operating temperature. If engine will not start or stalls after starting, proceed with next step.
Turn the key "OFF", then wait ten seconds.
Activate the self test by grounding the Self-Test Input (STI) connector.
Turn the ignition key "ON".
Record all codes received.
Turn ignition "OFF".

Data Link Connector (DLC)
(Located Underhood)

Analog Voltmeter Connection

Once you have the codes, check with the chart to see what it means. If you have a further question on replacing a specific part or further testing, just re-open this question and I will continue to help you until fixed at no addtional charge.

Please click the ACCEPT BUTTON or ask for more help. Positive feddback is always appreciated.

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