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Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 21599
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a fiat scudo 1.9D (non turbo). Every now and again,

Customer Question

I have a fiat scudo 1.9D (non turbo). Every now and again, it loses power (usually noticed on hills) and there's no acceleration. I don't get any warning lights and it then clears itself and runs ok.
Engine starts and runs fine..
Submitted: 1 month ago.
Category: UK Car
Customer: replied 1 month ago.
It doesn't happen every time I use the van, usually notice it on long runs. Sometimes it doesn't happen at all, but yesterday on a***** it did it twice, both times on hills, needing to drop down gears.
Customer: replied 1 month ago.
Air filler change and service have also been done within 3,000 miles.
Expert:  Matt replied 1 month ago.


I'd next 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 adding 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.

Customer: replied 1 month ago.
Hi Matt, thanks for the reply. It is a non turbo version though.And how can I check the glow plug relay switches off? It only does this very occasionally. It's not a hard fault. It is very intermittent. It doesn't go into limp mode and stay like that, it loses power for about a minute or so, then the power comes back. It can be ok for a long time then just lose power.
Expert:  Matt replied 1 month ago.


in that case I'd next look at the EGR vlave

Expert:  Matt replied 1 month ago.

you can check the glow plug relay with a current clamp onto 1 of the glow plug wires on a warm runnign engine

as there should be no current at all in this scenario

Expert:  Matt replied 1 month ago.

do you still need help?
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