Surging issue

[Webby_roller]

check leads.... seems like a similar thing i had happen and it happened to a couple of mates... We just waited till night and pulled the lead cover off and ran the car while someone moved the leads around....

Found it was a split lead after they got zapped and it began arcing to the valve cover....

just another thing for you to count out of the problem...

[Ashwee]

I have had the same problem for a long time. Replaced spark plugs, leads, distributor, checked and adjusted ignition timing, o2 sensor, checked all sensors, checked injectors, checked my exhaust, and ran injector cleaner through the car, reset my ECU a million times, and tried different fuel. Still happens. I noticed a slight improvement from cleaning my throttle body and IACV, but its still there. The only thing I can guess that I havent tested yet is my auto transmission, but I've known people with manual cars that still had the same issue.

[beeza]

Ashwee,that's exactly my problem I had FOREVA!

I would:

* Replace fuel filter
* Suburu Upper engine Clean the engine
* Calibrate the voltage on the TPS

The last one being important.

Also for $40 an injector you can get the spray rate and pattern fixed.

I had it done,the results were:

BEFORE AFTER

Spray rate Spray pattern Spray rate Spray pattern

Injector 1 - 3 3 5 5
Injector 2 - 4 2 5 5
Injector 3 - 5 3 5 5
Injector 4 - 2 4 5 5

[tiksie]

I have had the same problem for a long time. Replaced spark plugs, leads, distributor, checked and adjusted ignition timing, o2 sensor, checked all sensors, checked injectors, checked my exhaust, and ran injector cleaner through the car, reset my ECU a million times, and tried different fuel. Still happens. I noticed a slight improvement from cleaning my throttle body and IACV, but its still there. The only thing I can guess that I havent tested yet is my auto transmission, but I've known people with manual cars that still had the same issue.

Same thing happened to me, tryed everything, ended up being the dizzy was adjusted and too retarded.

Inspect your dizzy to see if its advanced/retarded..Just centre it for the time being to see if that changes anything, huge improvement for me.

[beeza]

Yeah,that's your engine ignition timing.

[FallenAngel]

Ok, i got a new set of NGK Spark Plugs, NGK Leads and a OEM fuel filter. Just put it in yesterday and the car doesn't seem to be as "boggy" as before. Although it still does have a slight hesitation still but i dont htink it is as bad as before.

It doesn't seem to want to stall anymore which is good but the hesitation is still there.

Another question, how do you check the dizzy? What are you meant to look for?

[jords]

clean your TB and the sensor.

[tiksie]

Does it do it between a certain RPM range ? Go for a drive and report back

[FallenAngel]

Usually around the 2-4k rpm mark, hence the cruising rpm area.

Going to head to epping today so i'll give a report on how it goes later this arvo.

[Ashwee]

I can tell you after cleaning my throttle body and IACV I have noticed its improved A LOT. I had all chunky bits of coolant everywhere, not sure if that was a separate issue, but the surging has gotten better, still happens but doesn't bog down too much.

[FallenAngel]

Ok went for a decent drive yesterday for about 2 hrs or so.

What i've noticed is that the surge mainly happens when crusing <100km/h. On the freeway it isn't really there. Also occurs more often when going uphill.

Its much better now since changing the spark plugs, leads, and fuel filter but the issue is still there.

I'll have a go at cleaning the throttle body and IACV tonight and report back on how it goes.

[Limbo]

sounds like timing is off