Work­shop man­ual

Car Mechanics (UK) - - Help! -

I have re­cently bought a 55-plate Vaux­hall Signum 3.0 V6 CDTI and can­not find a work­shop man­ual for the Z30DT en­gine. Do you know where I can get a man­ual? Haynes pro­duce one for the facelifted Vec­tra C, but it does not cover my en­gine.

The rea­son I’m look­ing for one is that, when ac­cel­er­at­ing at mo­tor­way speeds, there is a vi­bra­tion through the driv­e­train. I am un­sure if this is a mis­fire un­der load, as it mainly seems to hap­pen when in sixth gear. The car is run­ning on 19in VXR al­loys with 235-35 tyres (they were on the car when I bought it), which I’ve re­cently had bal­anced to rule out any vi­bra­tion from them. I re­alise these will be giv­ing an in­cor­rect speedome­ter read­ing, but I don’t think they will be caus­ing any other is­sues, al­though I be­lieve by us­ing Op­com I might be able to change the set­ting to in­form the man­age­ment sys­tem of the dif­fer­ent wheel size.

I plan to check for any en­gine fault codes to­mor­row us­ing Op­com. Oth­er­wise the car is a su­perb drive with no other faults. Neil Roberts

Al­though Haynes do not pro­duce a man­ual that will cover your ve­hi­cle, an elec­tronic down­load cov­er­ing your Signum with the Z30DT en­gine is avail­able from eman­u­alon­line.

com. This is a large down­load and the man­ual is run in a vir­tual ma­chine on your desk­top. This will work on a Mac or PC and sup­port is avail­able from eman­ual, but it does re­quire a cer­tain amount of com­puter savvy to load the pro­gramme.

There was a field rem­edy (No 2439) is­sued on the Signum with re­la­tion to noise from the front drive­shafts. The so­lu­tion is to de­tach the front drive­shafts from the hubs and grease the splines be­fore re­fit­ting. This rem­edy may not be per­ti­nent in your case, but it would be worth car­ry­ing out.

You have men­tioned that the wheels have been bal­anced and I am as­sum­ing that this cov­ered all four wheels. Ac­cord­ing to the data I have, the orig­i­nal wheels and tyres may have been one of four dif­fer­ent sizes: 215/55 R 16-93 V, 215/50 R 17-95 W, 225/45 R 18-95 W or 225/45 R 17-94 W. De­pend­ing which tyres your Signum was con­fig­ured with, the vari­ance of speedome­ter read­ing should not be more than 2% and should not cause any prob­lems.

Newspapers in English

Newspapers from UK

© PressReader. All rights reserved.