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Vauxhall Signum Low Power and Slow

with 2 comments

Vauxhall engine

I have recently solved a problem with my Vauxhall Signum 2004 1.9i Diesel and wanted to share.

The symptoms were:

  • Lacking power, slow to accelerate
  • EML comes on at engine start but goes off after driving a short distance
  • Noisy engine during acceleration
  • If over revved the Signum goes into ‘limp mode’ and the engine management light comes on until the engine is restarted

I found an excellent post titled Poor Performance … Check your boost pipes. Boost pipes are sometimes called vacuum pipes. I bought some 4mm internal diameter silicon pipe from ebay and started checking the pipes in the engine.

Within 10 minutes I found that one of the very short sections of rubber (just above the radiator close to the battery) had a split in it. I removed this and replaced it with a short section of my new pipe. I was doubtful that that was the cause of all my problems though.

I decided to go for a test drive …… what a difference. It was driving like a new car, turbo kicking in, powering away, a pleasure to drive. I have been embarrassed when pulling into traffic as it was taking up to 30 seconds to reach 30 mph before this fix.

On the same forum was another similar post with plenty of pictures called 2.2dti silicon boost pipes fitted (photos included). Thank you guys for posting your solutions which gave me the confidence to do it myself.


Written by barnabyfry

April 11, 2012 at 8:44 pm

Posted in How to, Personal

2 Responses

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  1. Hey, i,ve got a Signum similar to yours, same year probably, and has the same issue apart from the first line(power its quite the same) Its a 2.2 dti. I’ve already cleaned the EGR valve and the collector underneath it, it went fine for a day or two then same problem, keeping it for too long at 1500 – 2000 rpm there is sort of a pull like the engine would be spinning in mud then limp mode kicks in, a stop and restart of the engine fixes it but not for too long… I have tried reading the codes but , honestly , mechanics in italy ( or at least in our area) are not so versed in Opels (vauxhalls)… Any idea? I’ve recently replaced a blown section of a vaccum tube (about 30mm lenght) i don’t think it’ll be enough however… Could it be worn out glowplugs or…?


    March 15, 2015 at 4:23 pm

  2. u90a3u6211u53bbu770bu770bu9ec4u91d1u7532u5427u3002nu8fd8u662fu5927u4e09u7684u65f6u5019u9648u5e08u5085u5728u673au623fu7535u8111u4e0au770bu9ec4u91 Click


    April 10, 2016 at 1:38 am

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