Rough idle, Draper HT/coil tester, any good?

s40rch · Aug 3rd, 2011, 19:22

Hi, has anyone tried using Draper 38898 HT/coil tester?

Im having issues with a rough idle once warm, I have cleaned the ICV, genuine plugs, leads, oil filter all changed recently. Only thing left is the coils but dont want to splash out unless i know they are the issue.

Would the tool be able to diagnose anything?

Ryan
S40 1996 1.8 66k

Dog_Book · Aug 3rd, 2011, 19:26

If your idol is rough then so will be the engine running at any speed.

s40rch · Aug 3rd, 2011, 23:35

Quote:

Originally Posted by Dog_Book

If your idol is rough then so will be the engine running at any speed.

kind of, its ticking slightly at all speeds idles at about 550 though.

Dog_Book · Aug 4th, 2011, 10:35

Wont have anything to do with idle related parts then. Sound slike somthings not firing right then :P

Baffler · Aug 5th, 2011, 14:05

Take off the coil packs and clean the surface where they mate to the cam cover.

Have you also considered that it could be a faulty engine temp sensor, the one near the thermostat...? Disconnect it and see if there's a change in idle speed.

s40rch · Aug 6th, 2011, 17:04

Quote:

Originally Posted by Baffler

Take off the coil packs and clean the surface where they mate to the cam cover.

Have you also considered that it could be a faulty engine temp sensor, the one near the thermostat...? Disconnect it and see if there's a change in idle speed.

Had a look at the coils, check all the LT and HT(new) leads and there all fine. why would taking them off and cleaning the surface make a difference? The cam cover is pretty clean all round.

Disconnected the engine temp sensor, didnt make much change in the revs, the temp gauge went down when discounnected. I presume its all working correctly.

Is it worth trying the Draper HT testers? Although at the last service there were no errors on the ECU which should detect a faulty coil...

Baffler · Aug 6th, 2011, 22:57

The main part of the coil, where it connects to the cam cover, is made of ferrous metal and can corrode or rust and cause a poor connection.

I can't vouch for the Draper HT tester but I imagine it should do what it's supposed to. You could go the old fashioned route and test for a spark at each plug - no way of telling it's strenght though.

Your engine temp sensor appears to be functioning ok.

Have you checked all the breather and vacuum hoses/pipes for fractures. If there are any a can of starting gas will help you to trace them.

Aug 3rd, 2011, 19:22	#1
s40rch Member Last Online: Aug 8th, 2018 12:01 Join Date: Oct 2009 Location: wiltshire	Rough idle, Draper HT/coil tester, any good? Hi, has anyone tried using Draper 38898 HT/coil tester? Im having issues with a rough idle once warm, I have cleaned the ICV, genuine plugs, leads, oil filter all changed recently. Only thing left is the coils but dont want to splash out unless i know they are the issue. Would the tool be able to diagnose anything? Ryan S40 1996 1.8 66k

Aug 3rd, 2011, 19:26	#2
Dog_Book Idiot Last Online: Apr 21st, 2019 17:29 Join Date: Nov 2006 Location: Derby	If your idol is rough then so will be the engine running at any speed. __________________ Vectra VXR estate convert Experience = V40 1998 2.0 CD lots of mods Busy pestering the poor sods here now

Aug 4th, 2011, 10:35	#4
Dog_Book Idiot Last Online: Apr 21st, 2019 17:29 Join Date: Nov 2006 Location: Derby	Wont have anything to do with idle related parts then. Sound slike somthings not firing right then :P __________________ Vectra VXR estate convert Experience = V40 1998 2.0 CD lots of mods Busy pestering the poor sods here now

Aug 5th, 2011, 14:05	#5
Baffler Premier Member Last Online: Yesterday 21:18 Join Date: Dec 2002 Location: Co. Limerick, Ireland	Take off the coil packs and clean the surface where they mate to the cam cover. Have you also considered that it could be a faulty engine temp sensor, the one near the thermostat...? Disconnect it and see if there's a change in idle speed. __________________ Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.

Aug 6th, 2011, 22:57	#7
Baffler Premier Member Last Online: Yesterday 21:18 Join Date: Dec 2002 Location: Co. Limerick, Ireland	The main part of the coil, where it connects to the cam cover, is made of ferrous metal and can corrode or rust and cause a poor connection. I can't vouch for the Draper HT tester but I imagine it should do what it's supposed to. You could go the old fashioned route and test for a spark at each plug - no way of telling it's strenght though. Your engine temp sensor appears to be functioning ok. Have you checked all the breather and vacuum hoses/pipes for fractures. If there are any a can of starting gas will help you to trace them. __________________ Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)