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Posted (edited)

Hey guys,Ā 

had a search online and lots of different opinions so thought I’d make a topic.

not had the car long and only insured it last week to start using but has quite a bad misfire.

misfire seems to happen under normal driving off boost and sometimes when coming into boost. At around 2500rpm-3000rpm. Constant misfire that causes car to jump about until it passes it. Seems worse at lower speeds.

ive changed plugs, my leads are ngk blue leads, worth changing these?

compression test shows 160-170 across all 4

unplugging 02 sensor makes car seem a lot smoother to drive in general but the same misfire still persistsĀ 

other items I need I change?

Edited by LeonL
Posted (edited)

Hmm guess I’ll replace it allĀ 

Cheapest place for good quality lead set?

also arm and dizzy cap? Don’t want to end up with eBay knock offs :(

Edited by LeonL
Posted

If you go for uprated Magencore ones they will be around £100.00 but worth it imo. That said you may find a used set on here / the starlet pages on FB.

Toyota for Rotor Arm and Dizzy cap - not massively expensive items.

Posted

Ended up buyingĀ 

-red magnecor leads

-fuel filter

-dizzy cap

-rotar arm

all from id works so hopefully that sorts my problem because if not I’m pretty stuckĀ 

  • 2 weeks later...
Posted

Ive replaced and fitted the following:

- magnecor Ht leads

-new rotor arm

-new dizzy cap

-second hand coil

Ā 

just waiting on a boost hose so I can go drive and test for misfires! If it’s still missing then I’m stuck for ideasĀ 

Posted

UPDATE:

Ā 

cars still the same, misfire around 3000revs when going onto boost, sometimes really bad, sometimes it can push past it.Ā 

Ive replaced and fitted the following:

- magnecor Ht leads

-new rotor arm

-new dizzy cap

-second hand coil

-new plugs

compression test comes back fine.

whats myĀ options now?

Ā 

Posted (edited)

Could 02 sensor cause issues like this?

could an old shitty battery cause this issue?

Edited by LeonL
Posted

Have you changed the king lead from coil to dizzy ?Ā 

Mine has been running since I had it with a broken O2 sensor wire just fineĀ 

Posted

How about the dizzy itself did you change that?

Ā 

as new king lead will get good spark to dizzy but if dizzy is knackered it’s not going to be able to fully distribute spark correctly even with new leads cap and arm

Posted (edited)

I’ve not changed the actual dizzy it’s self no, just the capĀ 

Possible timing issue? Runs fine in normal driving though

Edited by LeonL
Posted
25 minutes ago, glanzadude said:

have a look anyways

My manifold does have a hairline crack that does allow a slight blowing but never thought it would cause such a serious issue?

Posted

I had a fault with a dizzy that when underload it wasn't able to produce the current but under normal driving it did

Ā 

Om another car I had a misfire problem and it was down to ther alternator belt looked and felt in great condition but real close inspection there was a few teeth missing and that caused all sorts of problems.

Ā 

if you can connect a voltage guage up which can be read whilst in car and see if there is a dramatic voltage drop underload that mightĀ help to narrow down problemĀ 

Posted

When turning heater on with all lights on it can cause the car to ā€œjoltā€ and the headlights dim for a few secondsĀ 

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