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Mpi Lack Of Power


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#1 Minivabnman

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Posted 14 September 2021 - 02:06 PM

When returning from a recent car show my car started to what i thought was a missfire, after struggling to get it home i did the usual checks of checking spark plugs and compression test, the comp test showed 200 psi on all cyls, and the plugs were of varying colours. I replaced the plugs with new and also the leads in case one was breaking down.Using the "Textbook" handheld unit it came up with only one fault code, "High voltage output at the temperature switch, the said switch was replaced with a new one, connection cleaned and refitted, cleared the codes and re tested the system, no codes found.

 

Testbook, indicates both Camshaft sensor and throttle switch are functioning correctly

 

I have another MPI which I started changing over electrical components:

1. Coil Pack

2. MAP sensor

3. Manifold Temperature sensor

4. New Cranckshaft sensor fitted

5. New Petrol filter fitted

 

I've even replaced the head gasket.

 

    all to no avail,

I don't have the correct adaptor to carry out a fuel pressure test, could it be the petrol pump not delivering sufficient pressure

 

The car starts and will tick over, it will even increase engine revs while standing still but as soon as you try to drive it it bogs down, the car will drive on a downward slope as long as you don't ask it to accelerate.

 

I'm at my wits end and looking for inspiration.

 

any suggestions



#2 viz139

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Posted 14 September 2021 - 08:00 PM

Sounds like it could be fuel, did you fill up on the run?(bad fuel) Possibly one injector failing?



#3 Minivabnman

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Posted 14 September 2021 - 10:16 PM

No, filled up the night before travelled approximately 30 mile before problems started earlier in the day



#4 pete l

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Posted 15 September 2021 - 07:32 AM

Check your air pipes around the inlet manifold, sounds a bit like a split air hose, I had this on mine.



#5 bpirie1000

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Posted 15 September 2021 - 09:49 AM

Sounds like a problem to me. Kind of need acceleration....

Check earth leads and make sure the engin is not rocking to far under load(accelereation) thi s can break connections and cause issues such as your having.

Have any of the sensors in the injection system been bashed at all?

Maybe even worth a fuel pipe check make sure not kinked and even contemplate a filter change for the fuel.

#6 pete l

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Posted 15 September 2021 - 01:26 PM

Yes, broken wires in the loom going to the inlet manifold, map sensor, throttle pot, iac valve, common problem.






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