V7 STi Clunking noise and power drop.

[BUGEYESTI]

Hey, I own a 2000 V7 STi, and on my way home from work today, sitting in traffic and rain, there was a consistent double knocking noise, and in the time between both knocks the RPM would drop 250-500. If it were just the knocking noise I would just assume it would be something with the suspension/shocks. I have to go see my mechanic tomorrow anyway, but thought I\'d ask here to see what anyone thought it could be?!

*It did this after I first bought it(6months ago) but stopped on its own accord, so didn\'t bother me.

*noise from what i could hear from driving was coming from back left ..

THANKS!

[boon]

Something wrapped around an axle? Although if it did it sitting still... ergh... gotta be something in the motor as nothing else is going round\'n\'round.

[BUGEYESTI]

Not that consistent, by the time i had got home it had stopped(was hoping it was still there to locate the noise). To me the sound was coming from the rear passenger side but I dont know of anything there that could be causing it!

[pedro]

Left rear passenger side is the area the fuel pump is ..Could be failing and may explain the revs changing at idle..Long shot but possible..

[boon]

 pedro said:

Left rear passenger side is the area the fuel pump is ..Could be failing and may explain the revs changing at idle..Long shot but possible..

In a V7 it\'s rear driver\'s side.

[Kiwi_Fozze]

 pedro said:

Left rear passenger side is the area the fuel pump is ..Could be failing and may explain the revs changing at idle..Long shot but possible..

pump is drivers side rear.

i do know of a common fault with the v7/8 inverted struts, particularly passengers rear, of the grease drying out due to age and the strut sticking inside the holder, but that\'s an easy fix and doesnt account for RPM drop.

if the mechanic says replace struts, tell them to sod off, just regrease them. easy job to do.

i\'d start to look at the state of your cv\'s and possibly rear diff??

[Pappu1]

I\'m with Kiwifozze on this one

Possible knocking strut

[BUGEYESTI]

Alright well see what happens tmorrow, and ill let my mechanic know what you guys said!

[BUGEYESTI]

My mechanic didnt really know, he checked the strut and said it was fine. He said the diff would be the last place he would look. My oil was low after it was filled up 1-2 months ago. He said without hearing/seeing whats happening himself or having the car for a few days he cant really come to a conclusion. Would it be worth taking it to subaru or a subaru specialist.

* It didnt make the noise at all today

* Still on the odd occasion has slight detonation even though runnig on 98(gull)

[Subirex Automotive]

if you in auckland than come and see me, ill check it for you.

[Kiwi_Fozze]

You\'ll benefit from a retune too, more powaaahhhh and reduce the det :-)

[Kiwi_Fozze]

Gull 98 is a 10% ethanol blend, recommend going to bp or mobil 98, less issues

[BUGEYESTI]

 kwi_fozze said:

Gull 98 is a 10% ethanol blend, recommend going to bp or mobil 98, less issues

k, ill give BP a go and see if it settles. Definetly keen on a tune when i getta turbo back exhaust(eventually)!

[BUGEYESTI]

 subirex said:

if you in auckland than come and see me, ill check it for you.

Yeah I\'m in Aucks, where bouts you based?

[MercuryFree]

 kwi_fozze said:

Gull 98 is a 10% ethanol blend, recommend going to bp or mobil 98, less issues

Note that Mobil 98 is also ethanol blend (or was last I checked!)

[Kiwi_Fozze]

 MercuryFree']

[quote name='kwi_fozze said:

Gull 98 is a 10% ethanol blend, recommend going to bp or mobil 98, less issues

/quote]

Note that Mobil 98 is also ethanol blend (or was last I checked!)

Depends on where in the country you are. Found it in most mobil stations south of taupo. Have yet to see anything around auckland at 10%.

[Pappu1]

straight bp98 and a nice tune to suit the mods

in all the ones i have done never noticed any issues etc

i have heard the ethnol blended ones are not always as consistant as the straight bp98....