Question about 1991 Oldsmobile Cutlass Ciera

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Code 53 ecm over 17.7 volts

Car runs very rough on idle but with a wide open throttle it run fairly well.
alternator is ok and charging fine. Is my problem a bad ecm? sometimes its very hard to start, after its been running a while. I have replaced everything, crank sensor, icm, coils? Can anybody help?

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Two month ago i started with the similar problem in a olds 90 2.3 tested all the sensors and... I realizad it´sa bad ECM or probably the Prom only I reasearched about and usually doen´t last more than 8 or ten years . they say are the component on it ..sympthoms: hard idle , start and sudenly stop except if you go to the HW ....and finally goes to LIMP function and finally blocks the inyection or the ignition control module ... I suggest try to test ur ECM or the Prom on it...

Posted on Jul 04, 2008

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Have you taken an actual voltage measurement at the battery?
If the voltage is in fact over 15 volts, it can cause all sorts of problems. If that is the case, the alternator will need to be replaced.

Posted on May 22, 2008

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Truck dies when idling


HI
first I would like to tell you, do this procedure only if the 5th digit of your VIN is C or K.

Description

The engine control module (ECM) learns the idle position of the throttle plate to ensure the correct idle. Anytime the throttle body is cleaned or replaced, the ECM must learn the new throttle position. The idle may be unstable or a DTC may set if the throttle position is not learned.

Conditions for Running the Throttle Learn Procedure

• DTCs P0101, P0102, P0103, P0107, P0108, P0111, P0112, P0113, P0506, and P0507 are not set.

• The engine speed is between 450-4,000 RPM.

• The manifold absolute pressure (MAP) is greater than 5 kPa.

• The mass air flow (MAF) is greater than 2 g/s.

• The ignition 1 voltage is greater than 10 volts.

Throttle Learn

Important: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code

(DTC) List - Vehicle.

1. Start and idle the engine in PARK for 3 minutes.

2. With a scan tool, monitor desired and actual RPM.

3. The ECM will start to learn the new idle cells and Desired RPM should start to decrease.

4. Ignition OFF for 60 seconds.

5. Start and idle the engine in PARK for 3 minutes.

6. After the 3 minute run time the engine should be idling normal.

Important: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

* If the engine idle speed has not been learned the vehicle will need to be driven at

speeds above 70 km/h (44 mph) with several decelerations and extended idles.

7. After the drive cycle, the engine should be idling normally.

* If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds

and repeat step 6.
8. Once the engine speed has returned to normal, clear DTCs.
Good Luck

Mar 04, 2014 | 1995 GMC Sierra

1 Answer

Alternator charging 17-18 volts


Have the CPU checked, it has the regulator in it. It also controls the idle.

Feb 28, 2014 | 1999 Chevrolet Silverado 1500

1 Answer

94 nissan pathfinder voltage to battery issue


run the fault codes and check for injector problems
batteries have no set life ( that is what the warranty is for--- new batteries regularly fail at the end of the assembly line ) so if could be failing
have a load test on the battery
Have an accredited auto electrician check the output of the alternator to check it and the voltage regulator
low battery voltage will upset the ECM program

Mar 21, 2017 | 1994 Nissan Pathfinder

1 Answer

This is a 1998 S10 it started to run rough just before i got, but i seemed to smooth out after a couple ofminutes, but now is will start but runs real rough, i will idile but real rough, it like lack a...


If this is the 4.3L engine with the spider fuel system, key on engine off fuel pressure, 60--66 psi. That spider fuel system is noted for problems. Some people have switched back to mfi because of the problems.
For your map sensor at idle-- 1.0--1.5 volts on the signal wire. At wide open throttle, 4.0--4.6 volts. Of course there is a vacuum source. If the engine is running poorly, it can effect sensors.

Apr 16, 2017 | 1998 Chevrolet S-10 Pickup

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I have a 97 ford probe 4cyl. I'd like to adjust the tps with a voltage meter, but want to be sure I do it right! My check engine light isn't on but car idles rough. I've had the tps replaced in...


wheather your a2 .0 or 2.5 at idle key on engine off its is 0.7V to 1.1 V. you test it by doing a sweep, with your volt meter,voltage should increase with smooth throttle movement there should be no drop out or glitches and at wide open throttle you should reach 4.5 V , (***) wide open throttle

May 07, 2011 | 1995 Ford Probe

1 Answer

My 03 g35 infiniti's engine was running very rough and infiniti mechanic is telling me that it's the alternator??? it's going to cost $850 for the repair.


You are right to have question marks. Just put a voltmeter across the battery terminals and if you can see 14.5 volts when the car is running then your alternator is more than likely OK. Take the car to Autozone and have the codes lifted from the PCM diagnostics. Running rough can have a variety of sources and in my book the alternator would not be one of them. It could be that a good clean out of your throttle body interior is all that is needed. Just disconnect the air ducting between air cleaner and throttle throat and using WD40 along with a cloth, wipe out any oily dirt on and behind the throttle plate. Re-assemble and check all vacuum lines to the inlet manifold to avoid leaks. If you still have problems the diagnostic error codes will help pinpoint the area to look at.

Oct 11, 2010 | 2004 Infiniti G35 Sport Coupe

3 Answers

Diagnostic codes p1505 p1507 ran stalled wont run turns over fine


sorry but their are no diadnostic codes with this number in the manufacturers codes i have
P0505....Idle Control System
P0507....Idle Control System RPM Higher Than Expected
but i have found these generic codes for you if they help

Aug 10, 2010 | 2003 Hyundai Tiburon

1 Answer

VEHICLES STARTS BUT GOES OFF IMMEDIATELY. iF GAS


The throttle position sensor responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage and emits the voltage signal to the ECM. In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM. Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This one controls engine operation such as fuel cut, etc. The throttle position sensor unit has a built-in “wide open and closed throttle position switch,” which is not used to control the engine. For the G35, the throttle position sensor is part of the throttle control actuator.

Jun 08, 2010 | 2004 Infiniti G35 Sport Coupe

1 Answer

My daughter was driving her 1997 Mercury Sable (not DOHC, just regular) said he heard a noise, smelled a burning smell (just for a second) and throttle opened wide (again, just for a second). She stopped,...


even though your reading 13.9 volts at battery at 2000rpms,
you need to load the alternator and battery to get a real reading,start car,put high beams,heater blower on high,and flashers on while in low gear,your going to have to have a friend help so you can test at battery with a multi meter.

Dec 30, 2009 | 1997 Mercury Sable

1 Answer

1993 pontiac grand prix 3.1 liter


the 3.1 had some EGR problems, EGR valve stuck open, blown diaphrams, Plugged passages Im not saying that is all your problems and I believe yours has whats called a linear EGR about $350.00 from the dealer (and that is the only place you ever consider buying such a critical part for the emissions system regardless of the cost)
That car is so antiquated as far as computers go that relying on the codes is nearly pointless! Map code can set because of low engine vacuum which you will have with a poor running engine, Check for 5 volt reference voltage at the TPS and MAP with the key on and engine off if no 5 volt reference I suspect a Computer. Computer Ground is on the Thermostat housing and needs to be clean and secure.
There is a legit test in the GM factory manual called the TAP TEST take the ECM (computer) and slap it with an open hand, if the symptoms change the ECM is bad it's very common in the early-mid 90s for the computers to go bad in one way or another the circuit boards come loose and suffer also from cold solder joints.
Make sure the wires are on the correct plugs and hopefuly you used factory plugs and wires and No split fire or bosch plugs only AC delco
Make sure you have good spark on all 6 cylinders.
Contact me at fixincars@yahoo.com with the results and any feedback or questions

Sep 19, 2008 | 1993 Pontiac Grand Prix

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