Question about 1998 Mitsubishi Eclipse

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Then how can you tell if a pcm in 98 eclipse is bad

When you turn the key the engine just cranks,then when you let off the key it will back fire, sprayed starter fluid in and it just backfires

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You most likely have a fuel supply or pressure problem
1, a shorted injector, (this caused all the other injectors to stop working or work very inefficiently)
2, the cam sensor (the ECM uses this as a reference in timing the injectors in conjunction with the ICM)
3, the lack of fuel pressure to them (all the many things that can cause this condition)
4, a bad ignition control module ( the computer uses the signals from ICM for a reference to time the injectors as it monitors and changes the ignition timing)
5, a bad crankshaft position sensor ( the ICM is using this to set the ignition timing and to send the reference signal to the ECM)

Posted on Mar 28, 2015

Testimonial: "thank you that makes a lot of sense,very helpful"

  • Robert Swatek
    Robert Swatek Mar 28, 2015

    There is another problem that can cause your problem also, it is a rare problem however, it can be a worn out ignition switch that will only power the ignition while in the run position and not the start position,,, so you will crank the engine and it will have no spark until you let off the key and as the engine stops turning suddenly you have spark again and bang,,,,, another is valve timing, but that will only happen if you need a timing chain or belt, and can be tested by checking compression,,, it will be very low if bad

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2 Answers

When i turn the key the engine cranks over but does not start, if i continue to crank it for a minute or two then it will eventually start and drive just fine. any ideas?


This sounds like a fuel system priming issue. When you first turn the key to the ON position (not cranking yet), you should hear a three-to-five second buzzing noise. This is the fuel pump running to pressurize the fuel system for cranking. This is controlled by the PCM and is relay activated. Once the vehicle starts and oil pressure rises, then the fuel pump is activated by the PCM via a different relay. If you can't start at first, what is probably happening is that the prime is not occurring and you have to crank it until the PCM sees oil pressure and then fires off the fuel pump. It could be PCM wiring or a bad fuel pump prime relay.

Oct 02, 2015 | Cars & Trucks

1 Answer

1997 jeep Grand Cherokee Laredo 4.0 4wd. All the gauges dropped and now won't start. I've replaced the computer but still nothing


wont crank or cranks fast but will not start,????????
wow first thing replaced the most expensive part on car.? why ?
replace PCM. ! wow ! what if used PCM (is it used) is bad,?
if so now 2 problems, Compounding every thing,.....$$$$$$$$

last time it ran was 1 week ago , 1 year, what? miles on it?
bad fuel in tank , old?
why not elaborate that key symptom first.?
there is a cluster there.
gauges, warning lights. many, all must glow.
lets do this dance, posted 100 times;. now.
  1. head lights work not dim? key in pocket.
  2. key on, not cranked ! (covered in missing oper. guide)
  3. all warning lights glow, if not battery is weak or fuses blown.
  4. and the CEL lamp there, it must glow or the PCM has no power ,that too, is a blown PCM fuse. fact. (or lamp dead)
  5. lets say the lamp was dead,CEL the scan tools hows status of the lamp and all else, so use a $10 scan too now. does it communicate with the PCM and show all sensors and not DTC errors? scan it now, cant fix cars now , with no scan tool , buy one, and win on old cars. big time with pay back !!! heck all cars. 96+
  6. so the CEL glows now, good, now you crank, now, does the crank shaft turn fast cranking, yes/no. yes !
  7. then check for spark , got spark x 6?
  8. got spark well test fuel works now , even with dry gas tank.
  9. is the ASD relay closing and then dropping,? ( yes, and yes)
  10. then that means the PCM cut fuel , on purpose !!!!
  11. the scan tool tells you why. it did drop for sure. scan it.

1993 to now , MR. ASD 101

http://www.fixkick.com/Jeeps/ASD.html

PCM is the engine EFI brain, it runs all spark and all fuel all the time. it also dumps the ASD to stop engine fires, by law.
confuses many, and all cars have this, one way or the other,
all EFI cars.

Feb 25, 2015 | 1997 Jeep Grand Cherokee

1 Answer

98 ford f150 has 4.6 motor cranks but no power to coils . Could this be a crank censor.


with any scan tool attached, you crank for 5seconds
and the tool will tell you what is or is not bad.
eg: if no DTC for Crank or cam sensors, its NOT THEM.
any OBD2 scan tool sold in USA works on this car. 1998,
any. the trick is.
1: keyon
2: crank for 5 full SECONDS.
3: release key , not off, wait for 1min.
4: see the DTC codes?????????
the PCM makes spark if the PCM is happy with the crank sensor
then it then uses what is called and igitor to fire the coils

better is to read the FSM on this car. (BOOK from dealer)

crank +cam >>>> PCM >>> ignitor the coil, the spark plus.
this is the path, note how the PCM is in the middle.
if it sees either sensor mess up 1 out of 10 times, it pukes, DTCS
like a swiss watch.

Jul 15, 2014 | Cars & Trucks

1 Answer

Pcm


Did you check the fuel pump relay ? The relay gets power from a fuse and also from the PCM relay. The computer grounds the relay to turn it on for 3 seconds when you turn the key on, then only after the computer "sees" RPM or oil pressure.

Feb 05, 2014 | 1997 Ford Explorer AWD

1 Answer

1998 honda civic lx no spark in to the plug


did you check fuses first?
there are 4 to 6 plugs all are dead?
which 98 engine option you have? name it. or cyl count and displacement.
so you checked at the coil. actual, if true, that is no spark. at all.
USA answers ONLY !
1: connnect scan tool to DLC 16pin connect, by knees.
2: i crank for 5 seconds, 1potatoe 2 potatoe . ....5
3: i release key,. not turn off.
4: the scan tools shows, DTCS for CMP or CKP bad. Yes, then BINGO.
the car the PCM makes spark fully,. the PCM has cam and crank
signals that the PCM uses to fire the IGNITOR.
this is the first check.

if no DTC errors, the Ignition or coil is bad. or just a fuse blown.
using said $9 scan tool check Pending DTC errors too.
for CMP or CKP, po340 or p0355, etc.

this will get you on the right side of the PCM every time.
the ecu/pcm first the COIL !

ask for help checking coil or ignitor.
or read the FSM , it covers that 100%
or at alldata.com


Jul 11, 2013 | 1998 Honda Civic

2 Answers

I HAVE A 95 MITS. ECLIPSE IT BACK FIRES SPITS AND SPUDDERS. I PUT NEW PLUGS NEW EVAP SYSTEM. I WAS TOLD MY O2 SENCER WAS BAD. WOULD THAT MAKE IT RUN BAD


Not to cause back firing,spudder

It will effect the performance some,
as it reports exhaust gases & that is
used to adjust injector timing

May 27, 2011 | Mitsubishi Eclipse Cars & Trucks

1 Answer

Hello I hope yall can help. I did an engine swap on my 98 dodge 1500 4x4 I put in the Same 360 motor but it came from a 97 dodge 4x4. Now When I turn the key to on the odomenter flashes along with A...


WHEN EVER YOU REMOVE ENGINE OR REPLACE ENGINE A SCANNER HAS TO BE USE TO REPROGRAM PCM, CMP AND CKP SENSORS TO FIRING INJECTORS AND IGNITION TIMING ALSO PCM AND THEFT SECURITY SYSTEM HAS TO BE RESET BEFORE ENGINE WILL FIRE.

Sep 05, 2010 | 1998 Dodge Ram 1500 4WD

2 Answers

97 plymouth voyager. no spark to cylinders


WELL I AM LOOKING AT AUTOMATIC SHUT RELAY BAD OR THE BAD COIL POWER TRANSISTOR.YOU WILL NEED A SCANNER TO TELL YOU IF YOUR CMP SENSOR OR CKP SENSOR IS WORKING.

Mar 01, 2010 | 1997 Dodge Caravan

1 Answer

1999 mitsubishi eclipse 2.0L na. no start. will crank. no power to coil pack. no codes. cam and crank sensor replaced. still no start or spark.


On this model engine, the power to the coil pack is delivered directly from the power transistors located inside the PCM.
If you are not getting the signal to fire going into the coil, verify you are getting a good waveform from the crank angle sensor, and that the wiring from it to the PCM is intact. If the crank sensor is delivering signal to the PCM, and the PCM is not generating pulse via the internal power transistors, the PCM has failed (the power transistors blow open, it is fairly common on this Chrysler PCM).

Oct 30, 2009 | 1999 Mitsubishi Eclipse

1 Answer

Engine swap on 98 eclipse how can I tell if I have conpatable eng


98 model had 33 psi fuel pressure.timing is 2-8 btdc idle speed 650 to 850. 95 model has 43 psi fuel pressure timing is 5 btdc idle speed is 750.check your cam sensor crank sensor . check computer fuse .check injector fuses. your has a distributor on your car you can check timing with a scan tool. as far as i see that not much difference in engines.use the scanner to see if cam and crank sensor working or computer problems.

Apr 14, 2009 | 1995 Mitsubishi Eclipse

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