GTST playing up? HELP

[IOWNU]

Hey guys,

My cousin got a GTST R32 recently from Japan, with a buggered engine. Recently, he bought a second hand engine and put it in the car.

Car is a 1990 model R32 GTST (AWD) Manual.

The problem:

If you drive the car normally, it drives fine. Very smooth, turbo spools well, car accelerates adequately. However, when you accelearte hard, it hesitates, backfires at high revs.

ANy1 can help?

[siksII]

it will most probably the coils or the spark plugs or a combination

first buy some new plugs and gap them to 0.8

if that does not improve the situation try swapping the coils for known good ones.

[TimmyC]

GTST (AWD) ?

is it a gts4 ?

[IOWNU]

it will most probably the coils or the spark plugs or a combination

first buy some new plugs and gap them to 0.8

if that does not improve the situation try swapping the coils for known good ones.

Thanx i've forwarded the information.

Also, at high revs it literally sounds like something is 'sparking' kinda like fireworks, followed by smoke coming out the exhaust.

IF YOu hammer it in first, it goes alright, just a bit of backfire, but in second, its bad, backfires and hesitates, doesn't go anywhere.

[IOWNU]

GTST (AWD) ?

is it a gts4 ?

Yeah it is, i just say GTST (AWD) coz a lot of ppl get it confused with the 4 dour GTSTs.....

[siksII]

Thanx i've forwarded the information.  

Also, at high revs it literally sounds like something is 'sparking' kinda like fireworks, followed by smoke coming out the exhaust.  

IF YOu hammer it in first, it goes alright, just a bit of backfire, but in second, its bad, backfires and hesitates, doesn't go anywhere.

yeah well that sounds like it could be what i explained as the misfire is worse with more load, so the higher the gear the earlier the misfire.

[sproosy]

Also, at high revs it literally sounds like something is 'sparking' kinda like fireworks, followed by smoke coming out the exhaust.

Sounds like its pinging

[siksII]

maybe but i doubt it, when the coils are stuffed it makes a noise like that as well, it is unburnt fuel ingiting on the way out, its high frequency popping, which is probably what he is explaining.

[IOWNU]

maybe but i doubt it, when the coils are stuffed it makes a noise like that as well, it is unburnt fuel ingiting on the way out, its high frequency popping, which is probably what he is explaining.

Yep its high frequency popping.

Also, i forgot to mention the car tends to stall in neutral or at low revs. Once the car is stalled, its hard to start again....i.e it doesn't start first time....takes a few attempts before it starts.

[siksII]

well due to the bad misfiring the plugs could be badly fouled, resulting in an unstable idle and making it hard to start.

first of all if were your friend i would pull out the plugs and have a look.

[IOWNU]

well due to the bad misfiring the plugs could be badly fouled, resulting in an unstable idle and making it hard to start.

first of all if were your friend i would pull out the plugs and have a look.

Thanx man for the help.

I told him to sus out the plugs.

How much would a new set of plugs cost?

[siksII]

u can use coppers if you change them regularly (5-10000kms) or else platinums/iridiums which will last a bit longer

coppers will cost about $18-25 a set, iridiums/platiunums will be about 90-120 a set (might not last long either if the car is running how it is now, so i would recommend coppers for now at least!)

[IOWNU]

OK another development.....we both have exams right now so haven't had time to check anything in detail....but now the car is very difficult to start, and very difficult to keep idle. Quite often it stalls, 90% of the time when started it just coughz, doesnt rev well, heaps of black smoke comes out the back!!! worried....

[siksII]

black smoke is extra fuel so its not a worry it most probably be plugs and maybe the base timing is set wrong.

[IOWNU]

yeah i thought that, from my experience, looks like the timing on that car is whacked.

Hopefully resolve the issue this week......thanks for ur ongoing help SiksII