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Misfire, hesitation, but allllll the spoool


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#1 st185Nic

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Posted 03 May 2014 - 12:55 PM

So car is back together after having everything out twice.
Started cold and everything was sweet.
Rev a bit after a couple of minutes and it starts misfiring. Yay. It's Still drivable but it's frustrating. Sounds like a wrx. Not cool.
Put some new petrol in and check for spark. All good. Can't find any vacuum leaks either...
When driving it really hesitates but the turbo spools no worries. Then suddenly it seems to launch. Any ideas?

#2 st182er

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Posted 03 May 2014 - 03:39 PM

I reckon spark leads. similar thing happen to me except mines a NA

new leads fixed the issue. or could be the dizzy


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#3 trentmeyer23

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Posted 03 May 2014 - 05:57 PM

Sounds like the timing is retarded, did you by any chance move the distributor? The turbo will spool but you will make very little power.

Edited by trentmeyer23, 03 May 2014 - 06:17 PM.

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#4 rev_head

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Posted 03 May 2014 - 10:07 PM

Yep sounds like timing to me aswell. with the timing retarded its possible to make shit power down low but it still feel good up top
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#5 st185Nic

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Posted 06 May 2014 - 09:05 AM

I never touched the distributor but I seemed to have fixed the issue by soldering in the o2sensor and also clamping a few hoses that weren't. Now it seems to happen intermittently so I'll have a look a the timing. Thanks for the help people

#6 st185Nic

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Posted 07 May 2014 - 05:03 PM

So it's still happening though not all the time and now sometimes before it's heated up. Timing seems fine unless the computer is retarding it because of something. Could or would it be caused by an exhaust leak?

#7 st182er

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Posted 07 May 2014 - 09:32 PM

The fact that you said it sounds like a subaru led me to believe it was a spark issue.

What about the fuel filter?

 

Are you loosing power when it sounds weird?


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#8 silycr

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Posted 07 May 2014 - 09:53 PM

Still sounds like a boost leak to me.... do you have a boost guage?



#9 st185Nic

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Posted 07 May 2014 - 11:16 PM

Yes to losing power, drops a couple of hundred rpm too and struggles to climb but after 2800ish it's fine. It seems revving it fixes the issue temporarily. But it can be 5 seconds before it's back or 10 minutes.

Yes to boost guage also. It seems to be boosting fine, almost to fine for running like shit.

#10 GT-FOUR

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Posted 08 May 2014 - 12:42 AM

 AFM could be shagged, mine did a similar thing but when engine was cold, not hot. Might be worth a try if someone else has one you can borrow

 

Had two people on seperate occasions ask if my car had a rotary engine in it thats how bad it sounded lol


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#11 silycr

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Posted 08 May 2014 - 10:00 AM

18-22psi vacuum as well(or any noticed difference)? If not then rule out leaks.

 

Can you try running your finger underneath the distributor along the edge of the cap? Any oil on your fingers?

 

Have you checked the inside of the cap and rotor?

 

Checked codes? This should show issues with AFM, O2 sensor, ignition circuit, etc. Always a good starting point.



#12 st185Nic

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Posted 08 May 2014 - 11:37 AM

No codes. First thing I looked for. There is oil around the dizzy o ring actually... vacuum seems normal. If anything it boosts to quickly. But I did change to a ct20b while changing the clutch.

#13 silycr

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Posted 08 May 2014 - 11:59 AM

Haha. Glad that 20b is getting some use.

 

I'd say the oil is causing the problem. I had the issue with my car a while back, where it caused severe missing to the point where it would stall at idle. Some throttle would bring the revs up and stop missing but it would lack power and miss under load. I rebuilt the dizzy and no problems since. I'd recommend replacing the rotor and cap at the same tip



#14 st185Nic

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Posted 08 May 2014 - 12:16 PM

Awesome. I shall do that. I just had a little play with the manifold studs and two of them aren't torquing up. But also they aren't finger loose

#15 pinkst162formylady

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Posted 08 May 2014 - 06:33 PM

what work was done recently? was the timing belt done?

#16 st185Nic

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Posted 08 May 2014 - 11:14 PM

I changed the clutch, and the turbo. That's it. Fluids obviously too. Oh I did break a few wires but they were alternator related and fixed. The o2sensor wire was damaged previously but was crimped together which I've soldered now.
While the turbo was off I had studs removed and a few helicoil a put in the head, starting to think I should've just done all of them.

#17 silycr

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Posted 09 May 2014 - 12:02 PM

I'd say try and get that dizzy rebuilt and if the problem is still evident go from there. It will need to be done anyway if it is leaking



#18 st185Nic

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Posted 09 May 2014 - 12:11 PM

Good point. I also just discover the drivers side drive shaft has spat a few bolts out. No idea how but i shall now need new ones. Are they a standard size bolt?

#19 silycr

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Posted 09 May 2014 - 02:12 PM

That's not good.... just go to the wreckers and pull some out of another driveshaft....



#20 TRD-021

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Posted 10 May 2014 - 10:37 AM

Do what silycr said, it will be a lot easier. You'll find that most bolts from the engine bay/ gearbox have 1.25 pitch even m12 & m14, most standard bolts that you find at bunnings will have 1.5 pitch. Not to mention the primary bolts from gearbox/engine will most likely to be made from higher grade and with magnesium or zinc coating.
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#21 trentmeyer23

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Posted 11 May 2014 - 12:35 AM

Worst case these are the Toyota part numbers. I am assuming you lost the C shaped washers/brackets as well?

43489-17010 - BRACKET
90110-10007 - BOLT

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#22 st185Nic

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Posted 19 May 2014 - 05:42 PM

Thanks Trent. I found a bracket in my cul'de'sac the other day that had one loop torn open, assuming one bolt came out, the other loosened and the bracket caught on the shield or box and ripped out

#23 Thingamajig

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Posted 16 July 2014 - 11:16 AM

Actually I in recent memory had a VERY similar issue on my N/A ST162 we tried leads dizzy etc etc, turns out the injectors were blocked. When they were cleaned it felt like a totally different car and fixed the issue. I do find issues similar to this is a tad overlooked, mind you my car is N/A not turbo so I Could be wrong :P



#24 st185Nic

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Posted 26 August 2014 - 04:27 PM

i fixed it a while ago, stupid old injector clip was brittle and old and in the process of me taking them off when doing the clutch a piece broke and got wedge underneath somehow preventing solid contact. i was ready to kill people. id dont he dizzy and leads, discovered the power steering idle up canister had snapped off a vacuum line so blocked those... ugh. and now more driveshaft issues



#25 Cuts

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Posted 26 August 2014 - 07:15 PM

ahhhh gtfours 


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