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Matt
Matt, Engineer
Category: Australia Car
Satisfied Customers: 20602
Experience:  Automotive Engineer for 20 years, BEng hons degree,
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450 SLC: my 450 slc will idle well but cannot accellerate

Customer Question

my 450 slc will idle well but cannot accellerate
Submitted: 1 year ago.
Category: Australia Car
Expert:  Matt replied 1 year ago.
Hello
this sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.
If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the inlet to the main engine fuel distributor (should be 5 to 5.8bar) and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.
If this is OK then remove the rubber intake boot from the fuel distributor and then unscrew on the top of the unit find the central nut , pipe feed into the fuel distributor and push down on the aluminum plate under the rubber boot you should see the main fuel metering pin / needle rise up smoothly as you push down the plate, if its sticky or dirty then its possible this is getting stuck.
If this is OK then remove all the injectors but leave them connected to their fuel lines and put all into a clear container then turn the ignition on and (having replaced the central feed pipe nut) push down on the aluminum plate all the injectors should spray at once and look for ones that aren't spraying as much as the others - and replace or ultrasonically clean as required.
Customer: replied 1 year ago.
I cant find any rubber fuel intake boot nor any aluminium plate to press down on. I will try to obtain a fuel pressure tester.
Expert:  Matt replied 1 year ago.
Hello
the car should be using the mechanical fuel injection system K- jetronic
this uses a mechanical air flow meter that is sucked open by the engine
this video may help
https://www.youtube.com/watch?v=a4fJAfXYxWk
Expert:  Matt replied 1 year ago.
Hi
do you still need help?

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