Question about 1995 Dodge Intrepid

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1995 dodge intrepid 3.3L cranks over and tries to start for a second then shuts down has fuel pressure at the fuel rail and is getting spark thinking possible that injectors arent firing does the crank pos sensor controll injectors or does the it have a cam sensor that control the injectors

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  • richard holcomb Oct 15, 2010

    no check engine light is not on, no codes in memory , there is no inertia switch, it does have spark so i assume it is getting a signal from crank sensor . but this engine appears to have a cam sensor too, so what im thinking is that sensor maybe bad , but im not dodge mechanic some engines use both cam and crank sensors .the cam i believe acts a a referencer to identify #1 for pcm .. it has fuel pressure at the fuel rail, and if i spray cleaner into throttle body, it fires up but dies. so it has to be fuel related. probably injectors not being fired, but not sure about dodge. if it a chevy then i would say ignition module in distributor. but this is distributorless ignition something has to signal the injectors. but i might be barking up the wrong tree like i said never worked dodge before

  • richard holcomb Oct 15, 2010

    also you sent me info about scanning for codes for obd1 this is a obd2 vehicle

  • richard holcomb Oct 16, 2010

    i have a 1995 intrepid that cranks over has spark has fuel at the rail does not have any codes in memory probably due to dead battery for a long time will fire if fuel is sprayed into intake while cranking but dies immediatly when stopped so something to do with injectors not fireing it has good spark at plugs so crank sensor is probably ok now does the cam sensor do the referencing of # 1 cyl for the pcm what else could cause the injectors to not spray or fire in proper sequence

  • richard holcomb Oct 18, 2010

    this car sit for 2 years because nobody could figure the problem . now im getting answers that arent even close to what i have asked i am not stupid i was a tech 4 10 plus years i do not have a battery problem it has a new battery it not the fuel pump relay i have swapped out the relay and theres fuel at the rail i dont have a [pressure guage but when the pressure at the rail is relieved, it builds back up as quickly as the key is cycled it has strong spark when cranked over it will fire momentarily when carb cleaner spayed into the intake its definately has a fuel problem the injectors arent pulsing what makes the injector pulse what i feel is the cam sensor isnt referencing #1 cylinder so the pcm cant properly send a signal to pulse injectors i have also asked if this vehicle has a inertia switch but have been told by other experts that it doesnt cause it was involved in a front end collision but dont have anymore details air bag didnt deploy so wasnt a heavy impact any clues to why injectors dont pulse

  • richard holcomb Oct 20, 2010

    thanks what i needed to know was really about the auto shut down relay and if it used the cam or crank sensor to ref #1 some older 4.OL jeeps used both and that ther wasnt a ineritia switch, as for the fuel it was drained and replenished way before it was fired hopefully i can figure it out now must be nice to have a library for resorces wish tehama co had one

  • richard holcomb Oct 20, 2010

    thanks for the info about the auto shut down relay

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  • Master
  • 1,340 Answers

The injectors are mainly controlled by the good output of an auto shut-down relay which is directly affected by the fuel pump relay straight from the PCM.The easiest way to check the fuel pump relay is turn on the key,wait a minute,and see if the fuel guage comes up to proper level,helps if you know fairly close how much gas you do have.A couple other things which could cause intermittent cranking are the ignition switch may be going bad,or a bad connection in the ignition wire harness but the ignition itself is way more common.Also a near dead battery.The lights will sometimes appear somewhat bright but to start requires lots and lots of power.A good battery should read near 13V.A bad one will read around 11.8,11.9V and could cause intermittent crank.A crank position sensor could cause it,but for the most part,if a sensor is bad the system either works or it does not.That's about all except do you have intermittent start or no start whatsoever,even jumpers?If this doesn't work or you need more help,just comment here and I will get an autolink to your post and reply ASAP.Good luck! Greg

Posted on Oct 16, 2010

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  • Greg McCarthy Oct 18, 2010

    You should have mentioned that it sat for 2 years from the start.Since you are a tech,you should know that the ethanol has pretty much junked out the gas which was in the tank and you have to flush that out before you can even get it to fire beyond a spray before going further.The injectors pulse from an auto shut-down relay according to the diagram I am looking at which is directly in-line between the fuel pump relay and the injector pulsers.This is what i will do though if you like.There is a library right up the street.I am not looking at a diagram for your specific car,which I apologize for,but i will go up there and take photos of the system or bring it home to see exactly what you have.Wouldn't you agree that most start/run systems are mostly the same with only little variation between components which are or are not within them though?I don't go up to the library for every answer but occassionally will.It's dinner time here now and I think they are open until 8 tonight,not sure.So between tonight and tomorrow I'll go up.I don't have to work tomorrow.I'm not strictly in this for the money though.I have answered almost 900 questions now and maybe 50 even have the opportunity to make money.I just know people get ripped off by many industries.If I see a question that has sat there for a week,even if I know nothing about it I will research it and try to answer it whether a money question or not.I have mainly electrical/electronic engineering degree and an aircraft mechanics FAA license.I have worked on appliances at restaurants,ovens,natural gas,propane,deep fryers,video game consoles,stereo displays at retail stores,Navy planes,my own cars,torn down rebuilt turbine engines,turbo prop engines,rotary engines,no car ones though.My own computer repair.I will go to the library anyway but if you feel I am not expert enough just say so,post a comment here,I will get an autolink and if you say no then I wish you well.Good luck. Greg

  • Greg McCarthy Oct 19, 2010

    They didn't have the 1995 Intrepid but I got a 3.3 for a 1996 Caravan.Good enough or not?This one shows the wire from #1 driver is white/dark blue coming from PCM.Fuel pump relay control is brown.Auto shut down is same in this system and is dark blue/yellow from PCM straight to the injectors and generator field,killing any reference to the input for the injectors.Cam position to PCM is tan/yellow,but you should have that ,orange is hot obviously.This shows the crank is gray/black.So,the auto shut-down relay basically controls all of the injectors and the pulse,as long as the fueul pump is good and you said it has been changed.There is no #1 cylinder reference in this system to start the rest.Please forget about Chevy for a minute and open your mind.You of all should realize,different makes have different ways to do the same exact thing.I have been reading these diagrams for 27 years.Good luck.Greg

  • Greg McCarthy Oct 20, 2010

    Lol,I just happened to be in email and yours popped up.I did not see the inertia switch either as a component enabler/disabler or referenced on the PCM pins.

  • Greg McCarthy Oct 20, 2010

    You're all good?If you need more help just comment here if you still can.I actually found a Haynes.I never experienced a Chilton til a few weeks ago and they have more remove/replace info but no electric.I always bought Haynes or manufacturer for motorcycle so I never knew.

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  • Dodge Master
  • 76,070 Answers

HELLO
If the CKP (crank position sensor) sensor is defective it will set a fault code in the memory of the ECM, the 1st step in repairing a problem of this nature is to check the ECM for fault codes, here is how u do that along with code definition's, just go to the link for the easy to do fault code retrieval procedure.

http://www.extreme-check-engine-light-codes.com/Chrysler%20OBD1%20Decoder.htm

Posted on Oct 14, 2010

  • yadayada
    yadayada Oct 15, 2010

    add

  • yadayada
    yadayada Oct 15, 2010

    some 1995's are OBD1, OBD2 was not a mandatory requirement by the EPA until 1996, a crank sensor will set a code as well as a cam sensor, u say u have spark, next do u have fuel reaching the cylinders a the right time or at all? spray starting fluid into the intake, if it starts u have a fuel problem, if no start then either the injectors are not pulsing ( this is checked with a special little tool called a "NOID") or the cam chain has jumped time or broken, if this is a 2.7 V6 then that is VERY poss.

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