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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21997
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Hi, i have a 2005 vauxhall vivaro 1.9 it tick over fine and

Resolved Question:

Hi, i have a 2005 vauxhall vivaro 1.9 it tick over fine and revs freely not under load, but when i drive it at the same speed for a period of time it won't then accellerate, so i then have to drop down a gear or when it is really bad i have to stop and rev it not under load,
then i can pull away again and most of the time it will be ok for a bit. I've had the van about 18 months and the problem is getting worse, it starts fine and the problem can happen in any gear.
Submitted: 2 years ago.
Category: Car
Expert:  Matt replied 2 years ago.
Hello

!st consider changing the fuel filter as if this partially blocked this will reduce pressure at the main pump

If OK then also check the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it.

If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly

If its a variable vane turbo (they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve

Also worth checking that the glow-plug relay is switching off as they can stick on and leave the glow plugs also on - on some cars this can force it into limp home

Also worth considering a bottle of injector cleaner into the tank as a clogged injector nozzle will reduce power and give poor combustion - the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked

Also check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.

Matt and other Car Specialists are ready to help you
Expert:  Matt replied 2 years ago.
Hi

do you still need help with this?