crap idle and engine power cut.
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teknoboi
'Ex Aristo Owner'


Joined: 23 Apr 2007
Posts: 497
Location: Perth

PostPosted: Sat May 29, 2010 3:51 pm    Post subject: crap idle and engine power cut. Reply with quote

hey guys, just recently car has been idling weird.

it only happens sometimes, but it seems that when i give it some stick, it will randomly just cut off, ie... rpm will hit say 2000-3000rpm and it will just lose power and drop in rpm to say 1200rpm. and then the car goes spluttery and is a bit hesitant to go. on normal driving its fine?

could it be spark plugs or coil packs? cause i got iridium toughs in there and they should be good for atleast 100000kms. they got put in @ 70000km. car has done 120,000kms.

any other ideas why this maybe happening?

PS. no CEL comes on when this happens.

cheers
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The Stable
=======
1996 Toyota Aristo 3.0V
Blitz ECU and BPU, all cuts removed. 1.2bar! fun!
http://www.youtube.com/watch?v=ekZSXocOxik <-BURNOUT!

1989 Kawasaki ZXR250 (ZX-2R)
19000rpm goodnesss
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Chappo
'Ex Aristo Owner'


Joined: 30 Apr 2007
Posts: 4813
Location: Perth

PostPosted: Sat May 29, 2010 3:54 pm    Post subject: Reply with quote

Check the MAP sensor.
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teknoboi
'Ex Aristo Owner'


Joined: 23 Apr 2007
Posts: 497
Location: Perth

PostPosted: Sat May 29, 2010 4:14 pm    Post subject: Reply with quote

cheers! the hose connecting to the map sensor was brittle and stiff and was rather loose! hopefully this fixes the culprit!

PS. 3 mins for a reply Smile gotta love that!
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The Stable
=======
1996 Toyota Aristo 3.0V
Blitz ECU and BPU, all cuts removed. 1.2bar! fun!
http://www.youtube.com/watch?v=ekZSXocOxik <-BURNOUT!

1989 Kawasaki ZXR250 (ZX-2R)
19000rpm goodnesss
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teknoboi
'Ex Aristo Owner'


Joined: 23 Apr 2007
Posts: 497
Location: Perth

PostPosted: Sat May 29, 2010 8:43 pm    Post subject: Reply with quote

doh, nope didnt fix the problem.

feels like it hits a rpm limit and then stops. feels like its missfiring. ill check the spark plugs and coil packs later....

meanwhile...what else could it be?
_________________
The Stable
=======
1996 Toyota Aristo 3.0V
Blitz ECU and BPU, all cuts removed. 1.2bar! fun!
http://www.youtube.com/watch?v=ekZSXocOxik <-BURNOUT!

1989 Kawasaki ZXR250 (ZX-2R)
19000rpm goodnesss
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Gillysparks77
'Big Daddy'


Joined: 29 Nov 2009
Posts: 577
Location: Melbourne

PostPosted: Sun May 30, 2010 6:59 pm    Post subject: Reply with quote

Have you checked for fault codes from the ecu
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rbdazzled
JZS147 Junior


Joined: 29 Jan 2008
Posts: 175
Location: Gold Coast, Qld

PostPosted: Sun May 30, 2010 11:11 pm    Post subject: Reply with quote

Check all your vacuum lines and also what's your boost doing when this is happening?
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teknoboi
'Ex Aristo Owner'


Joined: 23 Apr 2007
Posts: 497
Location: Perth

PostPosted: Mon May 31, 2010 12:14 am    Post subject: Reply with quote

havent had time to diagnose the problem. probably wont have time for the next couple of weeks as exams are coming up. so driving my other car for the time being. will update when i get the time to work on the car.

im thinking its most likely coil packs.
spark plugs arent due for change for another 50000kms.

theres a vibration, so im assuming that its only firing 5 Cylinders right now
_________________
The Stable
=======
1996 Toyota Aristo 3.0V
Blitz ECU and BPU, all cuts removed. 1.2bar! fun!
http://www.youtube.com/watch?v=ekZSXocOxik <-BURNOUT!

1989 Kawasaki ZXR250 (ZX-2R)
19000rpm goodnesss
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teknoboi
'Ex Aristo Owner'


Joined: 23 Apr 2007
Posts: 497
Location: Perth

PostPosted: Wed Jul 28, 2010 4:18 pm    Post subject: Reply with quote

okay finally got some time to play with the aristo.

before this, the engine felt like it was misfiring, and it was hesitant and shuddering. When i turn a corner, power would be cut for a couple seconds.

Ive narrowed it down to coilpacks/plugs/connectors/fuel filter?

first thing i changed when this started happening was plugs. I put in BKR7E gapped to 0.8mm.
the problem was still there, so then i changed all my coilpack connectors as they disintegrated as i unplugged them. Then I changed the coil packs(not new, but all from running engines)
i took out the plugs to see what they looked like, at the tips they were "whiter" than the usual brown.
i concluded it to be running lean? so then i looked to replacing the fuel filter. IF it was changed during compliance, it would be over 3 years old. IF it didnt, then i would assume it was the same one since new. I replaced it with a Z383 filter from autopro, fit like a glove! Cost 22 bucks.

So now i started the car up, and it started up fine, idled fine. Let her warm up for a good 5-10mins and then took her for a drive. On part throttle, the car accelerates fine. On more throttle it felt like it was missfiring again.

My question is, the plugs are like 15km old. Will they be fouled already if the blocked fuel filter was making the engine run lean? damaging the plug?

Currently in the process of re conning my original coil packs. they have no cracks whats so ever.

Any input would be awesome!

cheers
_________________
The Stable
=======
1996 Toyota Aristo 3.0V
Blitz ECU and BPU, all cuts removed. 1.2bar! fun!
http://www.youtube.com/watch?v=ekZSXocOxik <-BURNOUT!

1989 Kawasaki ZXR250 (ZX-2R)
19000rpm goodnesss
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2JZZZZ
JZS147 Diehard


Joined: 06 Jun 2010
Posts: 640
Location: South Melbourne

PostPosted: Wed Jul 28, 2010 4:22 pm    Post subject: Reply with quote

Oxygen sensor?
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teknoboi
'Ex Aristo Owner'


Joined: 23 Apr 2007
Posts: 497
Location: Perth

PostPosted: Wed Jul 28, 2010 4:27 pm    Post subject: Reply with quote

2JZZZZ wrote:
Oxygen sensor?


that was changed like 1000kms before the problem.

The oxygen sensor is used by the ecu on cruise, and low throttle. The ecu uses the fueling maps on the ecu and does not use the o2 sensor for high throttle. I think thats it.
_________________
The Stable
=======
1996 Toyota Aristo 3.0V
Blitz ECU and BPU, all cuts removed. 1.2bar! fun!
http://www.youtube.com/watch?v=ekZSXocOxik <-BURNOUT!

1989 Kawasaki ZXR250 (ZX-2R)
19000rpm goodnesss
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Chappo
'Ex Aristo Owner'


Joined: 30 Apr 2007
Posts: 4813
Location: Perth

PostPosted: Wed Jul 28, 2010 4:27 pm    Post subject: Reply with quote

o2 sensor wouldn't cause it to misfire and the hesitation..
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mxracer
'Mr. MotoX'


Joined: 04 Feb 2008
Posts: 674
Location: oh here i am .. PERTH

PostPosted: Wed Jul 28, 2010 4:59 pm    Post subject: Reply with quote

Fuel pump ecu?? Maybe not working on heavy load when it has to work harder. Try 12v bypass mod on fuel pump ecu, in the boot
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Bengy
'Ex Aristo Owner'


Joined: 28 Feb 2009
Posts: 1869
Location: Adelaide

PostPosted: Wed Jul 28, 2010 5:11 pm    Post subject: Reply with quote

I had the same problem. Coilpacks had cracks. Might also pay to check your idle speed control valve
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teknoboi
'Ex Aristo Owner'


Joined: 23 Apr 2007
Posts: 497
Location: Perth

PostPosted: Wed Jul 28, 2010 5:20 pm    Post subject: Reply with quote

just baked my coilpacks, did the recon on them. still the same. I took it for a drive just then, missing at all throttle positions.

gahhhhhh, i'll do the 12v relay mod for the fuel pump tonight when i finish work.

Does anyone know if spark plugs can be fouled with lean mixtures for a small amount of time?

difference this time was, that before, it would accelerate, hit say 2400rpm and stop and drop in rpm.
this doesnt do this anymore.

Could it be my fuel pump on its way out?
_________________
The Stable
=======
1996 Toyota Aristo 3.0V
Blitz ECU and BPU, all cuts removed. 1.2bar! fun!
http://www.youtube.com/watch?v=ekZSXocOxik <-BURNOUT!

1989 Kawasaki ZXR250 (ZX-2R)
19000rpm goodnesss
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vanquish
JZS147 Junior


Joined: 01 Dec 2007
Posts: 144
Location: Adelaide

PostPosted: Wed Jul 28, 2010 8:30 pm    Post subject: Reply with quote

Spark plugs normally foul with rich mixtures
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teknoboi
'Ex Aristo Owner'


Joined: 23 Apr 2007
Posts: 497
Location: Perth

PostPosted: Wed Jul 28, 2010 9:29 pm    Post subject: Reply with quote

im pretty sure, that spark plugs foul with alot of other reasons rather than just rich mixtures.

for example. if a car is running lean, the plug would overheat? that would inturn foul the plug?
_________________
The Stable
=======
1996 Toyota Aristo 3.0V
Blitz ECU and BPU, all cuts removed. 1.2bar! fun!
http://www.youtube.com/watch?v=ekZSXocOxik <-BURNOUT!

1989 Kawasaki ZXR250 (ZX-2R)
19000rpm goodnesss
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moffatt
'Mr Manipulation'


Joined: 12 Jul 2009
Posts: 1325
Location: Perth, WA

PostPosted: Thu Jul 29, 2010 12:45 pm    Post subject: Reply with quote

teknoboi wrote:
im pretty sure, that spark plugs foul with alot of other reasons rather than just rich mixtures.

for example. if a car is running lean, the plug would overheat? that would inturn foul the plug?


a foul is a deposit on the plug. when lean you'll burn to electrode and the plug can never be brought back to life.

Nick
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teknoboi
'Ex Aristo Owner'


Joined: 23 Apr 2007
Posts: 497
Location: Perth

PostPosted: Thu Jul 29, 2010 1:06 pm    Post subject: Reply with quote

just swapped coil packs one by one with the set i got from mxracer.

there was one moment where, the car was running fine for 5 mins, spiritedly... but on the way back home, it started to shudder/hesitate again! grrrr still has the same problem. Noticed when turning into my street, there was a loss in power out of turn on light throttle for a good few seconds again.

doing the 12v relay mod for the fuel pump now

will update!
_________________
The Stable
=======
1996 Toyota Aristo 3.0V
Blitz ECU and BPU, all cuts removed. 1.2bar! fun!
http://www.youtube.com/watch?v=ekZSXocOxik <-BURNOUT!

1989 Kawasaki ZXR250 (ZX-2R)
19000rpm goodnesss
Back to top
View user's profile Send private message Send e-mail
Chappo
'Ex Aristo Owner'


Joined: 30 Apr 2007
Posts: 4813
Location: Perth

PostPosted: Thu Jul 29, 2010 1:12 pm    Post subject: Reply with quote

Try change your ECU.. Sounds similar to my issue that I had (Except mine was almost un-drivable)..
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teknoboi
'Ex Aristo Owner'


Joined: 23 Apr 2007
Posts: 497
Location: Perth

PostPosted: Thu Jul 29, 2010 1:41 pm    Post subject: Reply with quote

chappo wrote:
Try change your ECU.. Sounds similar to my issue that I had (Except mine was almost un-drivable)..



okay, so i did the 12v fuel pump relay mod, shes still Missing! Will pop down to get some new BKR7E gapped to 0.8mm. if that still doesnt work, ill swap ECU!

i really hope my blitz isnt fecked! love this awesome ecu.
_________________
The Stable
=======
1996 Toyota Aristo 3.0V
Blitz ECU and BPU, all cuts removed. 1.2bar! fun!
http://www.youtube.com/watch?v=ekZSXocOxik <-BURNOUT!

1989 Kawasaki ZXR250 (ZX-2R)
19000rpm goodnesss
Back to top
View user's profile Send private message Send e-mail
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