Carmikey
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Rough idle??? Ideas?? (3sgte)
Just of recent, I was sitting at the lights, smooth idle as norm, when engine decided to have a slight mermer for a split second (dropping revs approx 1 or 200rpm), but quickly picking itself back up to norm again. Driving from there onwards felt a little laggy - slightly down on power & was ever so slighly missing, not under load though. The next day, it progressively became worse. Now on idle, its idling very low (500rpm) & sounds like I have a 3 quarter race cam in it. If I try to rev it quickly, it responses by coughing & wants to stall out. If I increase revs slowly, revs increase yet sounds quite crisp & doesnt miss. I had a quick look for any vacuum leaks, results = negitave (but I havent disregarded the possibility) My first approach was to replace the plugs - which I have done, result = unchanged. Secondly, I replace the distributor & buttton / rotor, result = unchanged. Tonight I will see if its throwing any fault codes. Next I was going to replace the leads but though it might be the Igniter or coil? Can anyone suggest or know what I should try next?
post edited by Carmikey - 2015/08/11 13:31:27
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brent310
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Re: Rough idle??? Ideas??
2015/08/11 13:21:47
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Hi Carmikey
You don't say if your MR2 is supercharged if it is I would check all hoses from the supercharger for leaks
regards
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brent310
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Re: Rough idle??? Ideas??
2015/08/11 13:36:22
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Hi all
my Mr2 AW11 4agze supercharged, injectors not pulsing this car has been rebuilt. all codes checked fuses relays, and continuity, earths all checked, ECU replaced and the igniter, distributor overhauled, it has good spark and power to the injectors
it wants to start but will not run because of injectors not pulsing.
any ideas.
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kojab
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Re: Rough idle??? Ideas??
2015/08/11 15:36:23
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Carmikey, you may have picked up some bad fuel.
92' SW20 3SGTE GEN2 GT Hardtop Holden Ls1 ECU 87' AW11 3SGTE Delco EFI ECU & 21 psi boost 71' KE25 3TGTE Delco EFI ECU Standard engine 24 psi boost 78' KE55 L67 Delco EFI ECU
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davidp_mr2
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Re: Rough idle??? Ideas??
2015/08/11 21:18:23
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Fuel, vac leak or TPS sensor would be a good start:)
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tiff_lee
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Re: Rough idle??? Ideas??
2015/08/13 02:23:42
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Just to clarify Scout your separate issue would be best placed in a thread of its own to avoid confusion.
Carmikey, so it's misfiring at idle I would remove one plug lead at a time to identify which cylinder/lead/plug/injector is suspect. Pull a single lead at a time and see if the idle changes, if it doesn't then try the next etc until you remove one and it makes no difference.
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Carmikey
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So it Starts & idles perfectly until thermostat opens up, then the revs drop & sounds like it has a 3 quarter race cam.
Ok... so i tried process of elimination.
i can't find any vac leaks, one by one I've swaped out the coolant temp sensor, didn't change, disconnected tps, no change, & i disconnected / unplugged the idle control valve, all seem to be functioning correctly. Still no change. Still investigating ðŸ˜
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tiff_lee
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The thermostat opening shouldnt effect anything other than the flow of water
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Carmikey
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I'm thinking maybe when it gets warm, it's not receiving correct signal for air / fuel mixture.. maybe running rich still & its
Choking??
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nick12
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A clogged fuel filter, possibly. Pressure below threshold could affect the injectors.
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stuka
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which generation motor is it Mike, does it have an air flow meter?
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Carmikey
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Hey Pat, it's a 96 gen 3 3sgte.
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Falcon
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Hi Mike Fixed yet? If not a bit of a long shot is to disconnect and seal off at the inlet manifold isolating the whole vacuum line and brake booster. It is more likely to be the igniter area though unusual that it doesn't misfire under load. Cheers.
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Carmikey
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All fixed... for now, but doesn't make any sence! The fix doesn't match all the symptoms.
I replaced the ignition leads, as they were only my list of things to eliminate & it seems they were the problem. I'm not fully convenience as yet, even though i have done 200kms on it since without an issues.
I've think it may have another intermediate problem, so only time will tell. Cant start diagnostics until it rears it head again ðŸ˜
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hotmr2
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it sounded similiar to what i had before ........
the result was stuffed ecu .... dunno really
1992 mr2 with 1995 gen na motor and LSD gearbox
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