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Old 09-12-2002, 12:09 PM
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Thumbs down '95 Aurora acting funny

My Aurora has been acting funny the last couple months. Usually in the morning, when it is cooler out, the motor fires up fine (after sitting all night). However, after it has sat in the sun all day, or more than 10 min after it has ran, it starts hard...it turns over quite a few times before firing. But if i turn it off and start it a few mins after shutting the motor off it is fine. Also, sometimes it fires up without any problem. I have noticed that if I hold down the gas pedal a little, and open the butterfly, it starts a little easier. I am stumped on this one...too bad its not carburated.

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Old 09-12-2002, 02:39 PM
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Cold start valve, Coolant temp sender, Idle air cotroll valve, Mass air meter or Barometric perssure sender might be sending bad info to the ECM during these cold start situations, have someone run a OBD check and see what the senders are telling the Injecters.
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Old 09-12-2002, 02:47 PM
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[quote]I have noticed that if I hold down the gas pedal a little, and open the butterfly, it starts a little easier.<hr></blockquote>
[list][*] Air Temerature Sensor[*] IAC Motor Sticking-Fouled[*] Run TSB's
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Old 09-13-2002, 04:02 AM
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Might check for leaky injectors, too. On a cool night sit the fuel that leaks by wouldn't evap. as it does on a hot day sitting. That would make your lines have air in them and take a minute for the lines to re-fill. I'm not sure about the self diagnosing ability of the engine,but with the age it could be any one or more of the items that have been listed in the posts.
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Old 09-13-2002, 08:44 AM
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Hey kultulz, TSB's or DTC's? <img src="confused.gif" border="0">
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Old 09-13-2002, 01:27 PM
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Its an Aurora, of coarse its gonna act funny


HRK <img src="graemlins/pimp.gif" border="0" alt="[pimp]" />

That was critisism.
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Old 09-13-2002, 02:11 PM
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...sheesh...

Don't ask me how I managed to make a double post. Old age is a terrible thing... <img src="graemlins/crash.gif" border="0" alt="[crash]" />

[ September 13, 2002: Message edited by: KULTULZ ]</p>
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Old 09-13-2002, 02:11 PM
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[quote]Originally posted by BstMech:


<strong>Hey kultulz, TSB's or DTC's? </strong><hr></blockquote>

Technical Service Bulletins.

I just had two GM problems recently that I might have not found the correct solution for if I didn't check GM TSB's.

What is a DTC?
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Old 09-13-2002, 02:46 PM
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KULTULZ: DTCs (diagnostic trouble codes) Com'on man you knew that! I figured that since he made no mention of retreiving any codes (check engine light or tapping into the DCL), or that his check engine light or MIL was even lit, that this would be his first step. If no light is on than TSBs are an excellant "next step". Hey chevy ss10 I have acces to Mitchell on demand and can get you those TSBs. Let me know if you need'em.
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Old 09-13-2002, 03:41 PM
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[quote]KULTULZ: DTCs (diagnostic trouble codes) Com'on man you knew that!<hr></blockquote>

...uh...i knew that... :o

To tell you the truth...so many big time initials floating around and each manufacturer using it's own system, you did trick me.

Let me tell you of my most recent adventures with my OTC 4000 Enhanced;
  • 1988 Cadillac DeVille...

    No start at times...intermittent rough idling...loss of power...

    Turns out the only code drawn is Memory Erased. Next draw, you get about sixteen codes that make you think the thing is about to explode.

    Turns out there is a TSB that was never performed regarding a bad system ground. It would have taken hours to chase every ground off the ECM.
  • 1989 (?) Olds Eighty-Eight 3.8

    Hard start...Stalls...Rough idle at times.

    Code set for Air Temp Sensor. Put it in all confident...helps but does not solve problem. No other code...ignition and fuel OK.

    OTC gives you TSB's on CD so run it. GM had a series of bad IAC motors. New IAC...It's a Pro-Stocker All Of A Sudden!

I have just gotten to the point that I automatically check for TSB's. It seems it helps in the diagnostics and saves you a lot of time.
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Old 09-13-2002, 04:39 PM
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Kultulz: Right on! Makes sense to me (straight to TSBs) I had a similar problem on an '89 Caddy (can't remember the model) it was running real rich (burning eye balls outside the shop) I checked it out and no codes, but I did notice on the datastream that all the temp. sensors were reading -38 degrees. So I checked the TSBs and it said to check certain pins for continuity to ground from ECM. All checks out OK so I'm standing there thinking about it a minute when the lady (the owner) said "It didnt start doing this until I changed the battery". Earlier I noticed the battery cables cobbed up and the SAME COLOR, I thought surely she didn't, but yes she hooked them up backwards. Turns out she blew a diode on that circuit inside the ECM. Lesson learned: Encourage the customer to talk because TSBs dont cover human error. Check this out go to <a href="http://www.obd2.com" target="_blank">www.obd2.com</a> or <a href="http://www.auterraweb.com" target="_blank">www.auterraweb.com</a> and check out their OBDII scanner software for Palm PDA's generic and enhanced versions available for about $200 each. Goes anywhere!
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Old 09-14-2002, 12:18 AM
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[quote]Earlier I noticed the battery cables cobbed up and the SAME COLOR, I thought surely she didn't, but yes she hooked them up backwards.

Turns out she blew a diode on that circuit inside the ECM. Lesson learned: Encourage the customer to talk because TSBs dont cover human error.<hr></blockquote>

I bet she was proud with that bill. Did she or another shop do the battery installation?

Thanks for the links!
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Old 09-14-2002, 06:25 AM
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I'v had this problem with my kin folks galant, I changed the fuel filter, and it ran like a 4 banger should.
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Old 09-14-2002, 07:03 AM
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KULTULZ: It was her or her husband, but there was no bill other than parts (I was doing it at school).
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Old 09-14-2002, 02:20 PM
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Thanks everyone for your input...I have one more variable to add:

Another thing that I have noticed is sometimes when I decclerate, the min I let off the gas, the rpm's go up and the car jerks forward, as if it is getting a shot of gas...doesn't happen everytime, but from timt-to-time.

Also, I noticed that I have 3 lines marked "fuel" on them ran into the engine compartment. Two of them go to the fuel rail (return and supply) and the other (vent?) goes into some plactic deal. There is a wire harness going to it and some vacuum lines...if I unplug the wire connection, nothing seems to change (no check engine lite, or anything), the motor runs fine. Does anyone know what this could be, and if it could be the problem?
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