UK Typhoon running bad

U

UK-typhoon

New member
Hi guys,

I'm in need of some technical help. My friend has a 93 Typhoon that has started running bad, it was only under hard acceleration, it splutters and will not accelerate, whilst sounding like the wastegate is fluttering open and closed. I have checked the fuel pressure with the FPR pipe disconnected and plugged and it sits at 43 PSI at idle. The plugs are very pale/white. Under normal driving/half throttle acceleration the truck runs fine. This has only come on recently.

The previous owner fitted a dump valve, uprated fuel pump, stainless exhaust from the turbo back and an external wastegate (no idea on make or model as cannot see any part number etc, but can post a picture of it). Since owning the truck my friend has fitted a MSD pro billet distributor after the original one died and a MSD 6 BTM and MSD coil. The previous owner gave a 10 in 1 chip and a 3 bar MAP sensor with the truck. I fitted these for my friend a few years ago, but the the truck would splutter real bad under hard acceleration, so that was removed and the truck ran fine, it went 12.8 in the quarter. But has not been able to repeat that in recent years.

Today whilst trying to get to the bottom of the problem I checked the fuel pressure again, still 43 PSI, but the truck smells to be running rich. I tried to check the timing but when i disconnected the tan wire under the heater core the truck would not run properly and had to hold the rpm up a bit, even then the timing was not stable at all. Switched off and reconnected the tan wire, but the truck still does not run right, cuts out when you put it into gear and the exhaust note sounds wrong. Whilst checking the truck I noticed a slight mist of exhaust fumes coming from the atmospheric dump on the waste, so i think the wastegate has a slight leak.

Would a leaking wategate cause the truck to run bad at idle now and under hard acceleration?

I've sprayed round all the vaccum hoses with carb cleaner to check for leaks and found none. I also bridged the pins on the diagnostic plug and came up with no codes.

Sorry for the long post, but I've tried to include as much info as possible.

Thanks for your patience reading this and any advice
 
S

Static

Member
Re: UK Typhoon running bad

Check your distributor cap and wires. When was the last time the truck had a tune up?
 
U

UK-typhoon

New member
Re: UK Typhoon running bad

I have checked the cap and rotor, they appear fine. Wires were changed less than 3000 miles ago, but will test them.
Can you explain what you mean by a tune up?

Thanks
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: UK Typhoon running bad

Where are you located? Got any pics?

A tune up = plugs, wires, cap, rotor, air filter, fuel filter changes... normal maintenance stuff.

Did you get a code when you disconnected the tan wire? Have you got the diagnostic CD/PDF files?

I'm in London if I can be of any help.
 
U

UK-typhoon

New member
Re: UK Typhoon running bad

I'm located in south east London.

I didn't check for a code after disconnecting the tan wire. I don't have the diagnostic CD/PDF, what is it?

The truck last had the plugs changed about 18 months ago, but has only been rarely used, doing less than 2000 miles.

Cap appears to be in good condition.

I don't have the cable/software to get data from the ECU.

What symptoms would a leaking wastegate cause?

Thanks
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: UK Typhoon running bad

I would have thought that a leaking wastegate would be just underpowered rather than causing sputtering and running bad and it shouldn't affect the idle.

Can you do a compression check on the engine? Any signs in the radiator of loss of fluid or white smoke out the back? Does the fluid have bubbles in it? Is there any pressure coming out of the oil fill tube at idle?

There is a CD which has all the manuals for maintenance and fault diagnosis. You may have the books as well. It has all the files as PDFs.

Where in SE London? I'm in Clapham.
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: UK Typhoon running bad

There she is! I've been in that truck! I met a chap called Fin who had it up in Lincoln and lost track of it when he sold it. Great to see a Green/Grey - rare and good looking trucks!
 
gringo76

gringo76

New member
Re: UK Typhoon running bad

I would guess tune up or loss of fuel while accelerating but I wuld think nothing to do with leaking waste gate. that would just make it slower as it is bleeding off exhaust that would normally be spinning turbo. do have a wide band meter on it to check af while it is sputtering?
 
U

UK-typhoon

New member
Re: UK Typhoon running bad

Thanks, you've given some ideas of what to look at next. No update yet, hoping to get some time on the car this week.
 
D

Damian

Member
Re: UK Typhoon running bad

Does the wastegate just dump to atmosphere? That will throw your a/f readings off.
 
U

UK-typhoon

New member
Re: UK Typhoon running bad

Hi,

Yes it does just dump to atmosphere, it was on the truck already when my friend bought it. It looks like it internal wastegate in the turbo has been welded up.
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: UK Typhoon running bad

Try disconnecting the WG first so it can't flutter and then be careful not to overboost it. That will al least rule that out. Easy to do.
 
U

UK-typhoon

New member
Re: UK Typhoon running bad

IMG_20141021_131921.jpg


ok, today I removed the his style external wastegate to check for the cause of it leaking and I found this hose attached to one of the fittings, it was not connected to anything else. Am I right in thinking this needs to be connected to pipe coming from the turbo to the boost solenoid?
 
J

Jkanser

New member
Re: UK Typhoon running bad

Damian said:
Does the wastegate just dump to atmosphere? That will throw your a/f readings off.
Click to expand...

No it will not. Whether a wastegate vents to atmosphere or is routed back into the exhaust makes no difference to the Air/Fuel ratio. Were you thinking of the blow off valve venting to atmosphere? That WILL affect A/F but not the cause of his problems. Check the plug gap, change wires and make sure the fuel filter is replaced as well.
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: UK Typhoon running bad

Have you verified the timing with the tan wire disconnected?

Rotor looks ok, what about inside the cap on the electrodes?

As I mentioned on the phone, I don't think the distributor is a problem. A lot of them have moisture and rusted pickups.

What turbo is on the truck; why the need for that wastegate? As for the connection, looks to me as though the wastegate needs to be connected to the bottom nozzle in that photo. Had a hose already. Positive pressure keeps it closed and when the solenoid opens, pressure is gone, the spring pushes down and dumps. Hard to say without instructions.

Why would the BOV affect AFR? The MAP is after the BOV and that is what determines fuelling no?
 
You must log in or register to reply here.
Top