Pinking Under Light Throttle 2800- 3500

[gtiburge 0]

hi i have had this problem for quite some time it seems to only occur when engine is cold and on light throttle cant hear it when it is warm, it dose pink briefly when warm when you open it right up from any revs but then stops! engine is healthy it shows 185/190 psi across all cylinders i have replaced many items just to get it running sweet

atp recon afm

h&h recon dizzy new coil

plugs

known good ignition amp

 

car is a standard 1988 1.9gti bar k&n induction kit

 

doesn't appear to be any air leaks and dizzy is set in the standard position and i run tesco 99 my only thought is fueling as it all so doesn't seem to pull from 4500 to redline as fast as i can remember my other gti's doing i was going to get some cleaned injectors to give that a try as the car was sat for 9 year prior to me having it but have done near 10000 miles since then and i would have thought that would be good enough for a blow out !

 

i was going to have it on a rolling road just to see what it is doing fueling wise but before i wast £70 on rr would be nice if there was any suggestions

 

any help much appreciated as rather frustrated

Edited May 5, 2015 by gtiburge

[jackherer 543]

Have you tried retarding the distributor a bit to see if that cures it?

 

The standard advance figures are for four star so haven't been relevant for years.

[gtiburge 0]

Have you tried retarding the distributor a bit to see if that cures it?

 

The standard advance figures are for four star so haven't been relevant for years.

i have but then it is flat as a fart would it be worth re curving on std compression/engine ?

[pugdamo 111 2 Cars]

Is it definatly pinking? A cracked exhaust manifold can sound similar so may be worth a look.

[mikeyd 13]

its not possibly a crack in the exhaust manifold ? that can sound similar to pinking

timed that post well!

[gtiburge 0]

Is it definatly pinking? A cracked exhaust manifold can sound similar so may be worth a look.

nope defo not that as have new mani

[gtiburge 0]

its not possibly a crack in the exhaust manifold ? that can sound similar to pinking

timed that post well!

mikey i borrowed a wiring loom of you some time ago and i remember u telling me you use a rolling road in shaftesbury am i right in thinking ? if so who was it ?

[jackherer 543]

 

i have but then it is flat as a fart would it be worth re curving on std compression/engine ?

It should stop pinking before it loses power so there is something else wrong. Getting the injectors cleaned/tested isn't a bad idea, also when did you last change the fuel filter?

[gtiburge 0]

It should stop pinking before it loses power so there is something else wrong. Getting the injectors cleaned/tested isn't a bad idea, also when did you last change the fuel filter?

yh i thought as much but i would much rather buy some injectors out right as i use the car daily and cant have it off the road the fuel filter is probable'y only 5000 miles old

[mikeyd 13]

sigma engineering at gillingham

[Anthony 1,003]

Unplug the vacuum advance and see if the issue disappears.

 

Certainly sounds like it's over-advancing under vacuum if it pinks on light load and not under heavy load.

[gtiburge 0]

Unplugged vac advance this morning don't pink at all plan of action get it recurved ? But I don't no why as engine is untouched as far as I no never not even had head gasket or shall I jest get the ignition timing set with it unpluged and leave it?

[welshpug 1,661]

is it the correct dizzy?

[gtiburge 0]

Yep it's the original from that engine but had it refurbished to standard spec by H&H

[Anthony 1,003]

Should be a Bosch dizzy with a part number ending 066 if it's for a non-CAT 1.9 GTi. Worth double checking as I've seen all sorts of incorrect dizzy fitted that appear to work but aren't right and you'll never get the engine running optimally with.

 

With a standard engine and the correct dizzy refurbished to standard spec, clearly it shouldn't be doing this - might be worth speaking to H&H to get their thoughts on the matter.

[gtiburge 0]

It's definitely the right one

[petert 588]

What's the base timing?

[gtiburge 0]

Not had a strobe like on it the marks are lined up with the original from factory

[welshpug 1,661]

there are no marks on the dizzy from factory.

Edited May 7, 2015 by welshpug

[gtiburge 0]

Well they certainly look like marks from factory(not just a scribe or ruff tap with chisel) the marks line up nearly bang on in the middle

[Telf 224 2 Cars]

Did you fix this issue?

 

I had a similar problem - it turned out the Dizzy was in need of a refurbishment- the springs inside had pretty much turned to iron filings - have you tried another dizzy?

[gtiburge 0]

Not got it fixed as of yet I have not got the vacuum advance plugged in at the mo as that seems to have stopped it for now the dizzy is a New recon from h&h ignition