Slight misfire (1.8t manual)

IanR75 · 23rd July 2015, 18:02

Under hard acceleration my car has developed a "slight" misfire. It's not there all the time however.

I've changed the plugs, but was just wondering where is the cheapest place to purchase plug leads? I may have to change the coil packs too.

Thanks.

suzublu · 23rd July 2015, 18:51

The most common cause for a misfire on the 1.8 is a leaking inlet manifold gasket

Most parts can be found from Mat at DMGRS http://www.dmgrs.co.uk

IanR75 · 23rd July 2015, 20:51

Thanks. I'll check that out.

RhinoTourer · 23rd July 2015, 21:16

I've used these to good effect:
http://www.ebay.co.uk/itm/4005992948...889%26_rdc%3D1

(Hope this link is allowed?)

Also check the plug gap is not to large, tired coils prefer a smaller gap.

A plug gap of somewhere between .65 & .75mm may help.

stevestrat · 24th July 2015, 06:39

A misfire under acceleration is more usually a sign of a tired coil park rather than the inlet manifold gasket.

23rd July 2015, 18:02	#1
IanR75 Regular poster Rover 75 Saloon 1.8t Petrol Join Date: Oct 2014 Location: Southport Posts: 53 Thanks: 56 Thanked 2 Times in 2 Posts	Slight misfire (1.8t manual) Under hard acceleration my car has developed a "slight" misfire. It's not there all the time however. I've changed the plugs, but was just wondering where is the cheapest place to purchase plug leads? I may have to change the coil packs too. Thanks. Last edited by IanR75; 23rd July 2015 at 18:06..

23rd July 2015, 21:16	#4
RhinoTourer Regular poster ZTT 1.8 T Join Date: Aug 2014 Location: Wiltshire Posts: 31 Thanks: 4 Thanked 5 Times in 4 Posts	I've used these to good effect: http://www.ebay.co.uk/itm/4005992948...889%26_rdc%3D1 (Hope this link is allowed?) Also check the plug gap is not to large, tired coils prefer a smaller gap. A plug gap of somewhere between .65 & .75mm may help. __________________ Exhaust Bushes Replaced. (Twice ) Fuel Sensor Wires Repaired. F.O.C Fitted. Washer Bottle Pump & Grommet Replaced. (Twice ) HT Leads Replaced. Starter Motor Earth Repaired. Replaced Engine - Liners dropped Air Con Self Service X2 Coil packs Replaced Full Clutch kit. Rear Brake cylinder Replaced Radiator replaced. ODBII Scanner available.

24th July 2015, 06:39	#5
stevestrat This is my second home ZT260 #243 (resting) Join Date: May 2010 Location: Prestonpans Posts: 22,487 Thanks: 650 Thanked 4,624 Times in 3,358 Posts	A misfire under acceleration is more usually a sign of a tired coil park rather than the inlet manifold gasket. __________________ Steve T4 Location Map

23rd July 2015, 18:51	#2
suzublu This is my second home rover 75 1.8 vvc club se wedgwood blue Join Date: Aug 2009 Location: Seaton Carew Posts: 26,922 Thanks: 65 Thanked 7,142 Times in 4,642 Posts	The most common cause for a misfire on the 1.8 is a leaking inlet manifold gasket Most parts can be found from Mat at DMGRS http://www.dmgrs.co.uk

23rd July 2015, 20:51	#3
IanR75 Regular poster Rover 75 Saloon 1.8t Petrol Join Date: Oct 2014 Location: Southport Posts: 53 Thanks: 56 Thanked 2 Times in 2 Posts	Thanks. I'll check that out.