My 97 does something weird.
Thread Starter
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Tuned
Joined: Mar 2015
Posts: 272
Likes: 0
From: Texas
My 97 does something weird.
Ok, so I go out to start my 97 the other mornin, get in it let the glow plugs run about 40 seconds (I have them on a button) it fires up and revvs up to 4k BY ITS SELF, I kill the key soon as I think to do so (it sacred me at first and couldn't think what to do.) It dies, then I start it back up in the stock setting on my hydra and shift it to my daily driver tune and it dies, I put it back in stock run the glow plugs again and start it up and put it in DD and it stays running this time.
So with all that said, why did it rev all the way to 4k by itself? It was 28°F when I started it up and I had the hydra in DD the first time when it did that. It's running fine now and I went on an over night road trip with a 16 foot stock trailer and everything was more then good, it it's just kinda got me nervous now.
thoughts?
So with all that said, why did it rev all the way to 4k by itself? It was 28°F when I started it up and I had the hydra in DD the first time when it did that. It's running fine now and I went on an over night road trip with a 16 foot stock trailer and everything was more then good, it it's just kinda got me nervous now.
thoughts?
Thread Starter
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Tuned
Joined: Mar 2015
Posts: 272
Likes: 0
From: Texas
anything's possible I guess. I might could have even had my foot on the throttle and not noticed I suppose.
it does still act funky though when changing tunes from stock to any other tune in my hydra
it does still act funky though when changing tunes from stock to any other tune in my hydra
Thread Starter
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Tuned
Joined: Mar 2015
Posts: 272
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From: Texas
it's been installed nearly a month now. Everything was good and working fine until the other mornin
Lead Driver
Joined: Apr 2016
Posts: 7,213
Likes: 1,342
From: Bahstun
pull the chip and see if it does it again in a few days
put back in and see if it still does it
put back in and see if it still does it
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Thread Starter
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Tuned
Joined: Mar 2015
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From: Texas
I've been thinking on trying that. I wondered if maybe the chip wasn't getting a good connection.
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Post Fiend
Joined: Dec 2009
Posts: 15,505
Likes: 18
From: Livoina,La
Holding the go pedal won’t do that. Go hold the pedal to the floor and start it. It will just idle until you let off and it activates the IVS. If it does rev up then you have IVS issues. To me it sounds like the ipr was stuck
Thread Starter
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Tuned
Joined: Mar 2015
Posts: 272
Likes: 0
From: Texas
Couple the IPR cause the engine to die and or lope really bad when going from stock to daily driver on my hydra? When I start it up in DD everything is fine, but when I start in stock and switch it to DD it acts weird.
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
I agree with Mike, only thing that makes sense but would think a code would be thrown.
About normal if your chip has the high idle feature programmed. Stock OBS PCM's don't have that feature. Ask your chip vendor if on this tune (whatever it is) does it support high idle when cold.
About normal if your chip has the high idle feature programmed. Stock OBS PCM's don't have that feature. Ask your chip vendor if on this tune (whatever it is) does it support high idle when cold.
Laughing Gas
Joined: Feb 2014
Posts: 774
Likes: 25
From: Reno, Nevada
The contacts on the PCM where the Hydra connects can get worn and not make good contact. They say that the solder coating should still be there with no copper showing through. There is at least once place that will re-coat them if you send it in. Not sure if a bad chip connection could cause a runaway RPM condition though.
I have a Hydra chip and had the opposite problem only once. Started it and stepped on the go pedal and nothing happened, wouldn't go past idle. I turned it off and restarted it and everything was fine.
I have a Hydra chip and had the opposite problem only once. Started it and stepped on the go pedal and nothing happened, wouldn't go past idle. I turned it off and restarted it and everything was fine.
Thread Starter
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Tuned
Joined: Mar 2015
Posts: 272
Likes: 0
From: Texas
I agree with Mike, only thing that makes sense but would think a code would be thrown.
About normal if your chip has the high idle feature programmed. Stock OBS PCM's don't have that feature. Ask your chip vendor if on this tune (whatever it is) does it support high idle when cold.
About normal if your chip has the high idle feature programmed. Stock OBS PCM's don't have that feature. Ask your chip vendor if on this tune (whatever it is) does it support high idle when cold.
I know on my chip I have a high idle setting all by its self.
Thread Starter
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Tuned
Joined: Mar 2015
Posts: 272
Likes: 0
From: Texas
The contacts on the PCM where the Hydra connects can get worn and not make good contact. They say that the solder coating should still be there with no copper showing through. There is at least once place that will re-coat them if you send it in. Not sure if a bad chip connection could cause a runaway RPM condition though.
I have a Hydra chip and had the opposite problem only once. Started it and stepped on the go pedal and nothing happened, wouldn't go past idle. I turned it off and restarted it and everything was fine.
I have a Hydra chip and had the opposite problem only once. Started it and stepped on the go pedal and nothing happened, wouldn't go past idle. I turned it off and restarted it and everything was fine.