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Re:G13BB Engine runs rough intermittent

  • Owl
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24 Mar 2020 02:39 #220203 by Owl
Had CAT converter checked and it is OK to go. Found the back end fuel rail bolt was slightly loose leaking a small amount fuel, have tightened and sealed that. Thought that was the problem but it wasn't.

The symptoms persist, more so when the engine gets to operating temp, its affecting the idle , the idle fluctuates from approx. 800-850 rpm to 1000, up and down, erratic, it did stall once at idle. Today it drives ok but the idle was more the problem. Its erratic, it can occasionally feel like a misfire, sometimes a little surge but not consistent. Its strange.

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  • Lambert
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24 Mar 2020 05:24 #220205 by Lambert
Then Martin's assessment of a sensor being bad is correct.

Dreadnaught (black 2011)

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24 Mar 2020 08:36 #220207 by mlines
Idle going up and down can be a split hose in the intake/emissions system.

A test for this is to carefully (its explosively flammable) squirt "Easy-start" around the pipes. If the revs rise then you have found the hose thats leaking.

Martin

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses

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24 Mar 2020 10:05 #220211 by CC Baxter
Excellent! Old fashioned, easy route mechanics. I doubt they still teach this stuff which partly explains high labour charges. Chris

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25 Mar 2020 08:05 #220244 by Owl
Gday Martin and All , Ive pulled the cam sensor out and it is wet with oil. Is it supposed to be in contact with the engine oil? Owl

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25 Mar 2020 08:08 #220245 by Owl
Yes did that with some carb clean spray and nothing definite came of it. I thought for a minute when I sprayed the fuel regulator the engine stumbled but later it didn't show symptoms. The carb spray cooled the area down for a short time.

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27 Mar 2020 07:22 #220304 by Owl
Got a diagnosis for the problem, IAC Valve fault, open circuit, part no: 18137-64G01

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05 Apr 2020 01:48 #220707 by Owl
Hello All, Got the engine repair done, it was the IAC valve sometimes known as ISC solenoid on other vehicles, very expensive part so I sourced a very expensive non gen part but still a couple hundred less than gen part. The idle and performance is stable and smoother. Thanks to all for advice, Martin picked it as a likely sensor issue. thanks Owl.

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