Toyspeed.org.nz Message Board

by **doin donuts** » Thu Jul 21, 2011 5:55 pm

Hey all.

I have a smallport 4age in my ae85 and im having issues,it splutters and struggles below 3000rpm but goes fine after that,Iv changed the dizzy cap but any other ideas?gonna have a go at the plugs tonight tonsee what they are like.

Thanks all

by **LEAKER** » Thu Jul 21, 2011 6:16 pm

Any fault codes?

by **doin donuts** » Thu Jul 21, 2011 6:18 pm

Don't know how to check it?it's in an ae85

by **rollaholic** » Thu Jul 21, 2011 6:20 pm

who did ya wiring?

if it was nic, ask him what he did with the diagnostics plug

i presume you are using all smallport parts - ecu etc

by **doin donuts** » Thu Jul 21, 2011 6:29 pm

Yeah he did and know where the plug is but how do I actually check for codes etc?what do I use?

by **Truenotch** » Thu Jul 21, 2011 7:16 pm

Club4ag has all of your answers
http://club4ag.com/faq_and_tech_pages/E ... 0Codes.htm

But try new plugs first, it's always a good place to start. Also check for vacuum leaks and anything else that might be giving the ECU a bung reading. I had similar issues for a long time because a previous owner had removed an economy gauge without blocking off the line.

by **doin donuts** » Thu Jul 21, 2011 7:25 pm

Truenotch wrote:Club4ag has all of your answers
http://club4ag.com/faq_and_tech_pages/E ... 0Codes.htm

But try new plugs first, it's always a good place to start. Also check for vacuum leaks and anything else that might be giving the ECU a bung reading. I had similar issues for a long time because a previous owner had removed an economy gauge without blocking off the line.

Ok sweet thanks man il try plugs first then go from there.

by **QikStarlie** » Thu Jul 21, 2011 8:06 pm

is worth trying another ecu if above ideas fail. have had a faulty smallport ecu cause same symptoms. tried everything. then changed ecu. boom, problem gone

by **doin donuts** » Thu Jul 21, 2011 8:56 pm

QikStarlie wrote:is worth trying another ecu if above ideas fail. have had a faulty smallport ecu cause same symptoms. tried everything. then changed ecu. boom, problem gone

Ok il give that a go after if not fixed.need to find another smallport ecu

by **rollaholic** » Fri Jul 22, 2011 8:09 am

pretty sure i still have one chief if you get stuck

when its running like poos, is it misfiring? or has it just got no go.

by **doin donuts** » Fri Jul 22, 2011 8:42 am

rollaholic wrote:pretty sure i still have one chief if you get stuck

when its running like poos, is it misfiring? or has it just got no go.

Yeah?might get ahold of you if plugs don't work. From idle to about 3k it back fires a little but just has no go,if I'm stopped I have to drop the clutch at round 3k,don't get me wrong,in the rain and in a rwd it's bloody fun but annoying as I start work at 4am and have a 1 month old baby boy so don't wanna wake him up

by **doin donuts** » Fri Jul 22, 2011 6:37 pm

Ok so plugs did nothing,it's getting worse and starting to back fire....HELP

by **RedMist** » Sun Jul 24, 2011 10:24 am

Sounds like it's getting no TPS input. Computer thinks it's got no throttle so adds no fuel. Misfire is a lean misfire. I'd be very wary of running it as is. You'll be running extremely lean mixtures.
I'd check TPS wiring, TPS and computer.

Does the smallport also run MAP? I'm getting so rusty on my 4age stuff.

by **doin donuts** » Sun Jul 24, 2011 11:06 am

RedMist wrote:Sounds like it's getting no TPS input. Computer thinks it's got no throttle so adds no fuel. Misfire is a lean misfire. I'd be very wary of running it as is. You'll be running extremely lean mixtures.
I'd check TPS wiring, TPS and computer.

Does the smallport also run MAP? I'm getting so rusty on my 4age stuff.

Ok so running with that would changing the ecu fix it? Iv also been told could be leads?

by **RedMist** » Mon Jul 25, 2011 8:14 am

I'd check TPS wiring, TPS and computer.

It could also be leads, coil, injectors, fuel filter, fuel pump, air filter, AFM, vacume leaks

by **doin donuts** » Mon Jul 25, 2011 8:39 am

Ok sweet thanks,doing leads today and ecu so will see what happens

by **doin donuts** » Tue Jul 26, 2011 5:55 pm

Well thanks to rollaholic I'm good to go,was ecu,well at least I hope it was,changing it seemed to fix it? Here's hoping!!

by **doin donuts** » Sun Mar 25, 2012 10:18 pm

Ok so problem has surfaced itself again last night!! Drives like a pig below 3k but sweet after that and at idle it's struggling and surging.

Anyone have a diagnostic reader I can throw on it?

Cheers all

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