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Will Car Run With Bigger Injectors

ARTZ

By ARTZ,
in Engines & Forced Induction

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ARTZ Grand Master

ARTZ

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Posted (edited)

Ok so i put bigger injectors in last week (no i havent put new ecu in yet, and yes i know it needs one) and just out of interest i fired it up to see if it would run..

And it did it sat and idled away perfectly maybe with a slight miss but good enough that i thought i wonder if it will drive (albeit very gently) so i can get it to the shop...

Well it got till the end of the block ok, and then started running like shit, now it will barely idle. you know that running on 5 cylinders styles.

what i am wondering is this just because of the injectors, and if so why did it idle and rev so cleanly before i tried to drive it

Or should i be looking for something else maybe??

I cant find any leaks , though there was a small amount of smoke assume is just wd40 or something

Was hoping it may run so i dont have to get a towtruck to the shop...

Edited by Arthur T3
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blind_elk Grand Master

blind_elk

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Larger injectors will, obviously, deliver more fuel.

At idle, there is virtually no load on the engine, and the fuel delivered by the ECU is only slightly more than is necessary. Even free-revving, there is very little load on the engine, so the additional fuel from the bigger injectors is able to be coped with by the engine.

When you start driving, the load on the engine increases, and the ECU delivers more fuel. The bigger injectors deliver even more fuel, and the mixture becomes super rich and doesn't burn correctly. So you end up coating the plug electrodes in fuel, and the plugs don't spark efficiently.

Edited by blind_elk
ARTZ Grand Master

ARTZ

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  • Author
Posted (edited)

ok that makes perfect sense then...

there was a huge layer of soot on my exhaust when i got back so no doubt on my plugs too..

So if i cleaned the plugs off it would probably run fine again until i tried to drive it...

damnit Towtruck it is then...

Cheers... :)

Edited by Arthur T3
JonnoHR31 Grand Master

JonnoHR31

Posted
Posted

also most bigger injectors have a higher latency than standard injectors, so at idle it can even out and run perfectly (fluke) but as soon as you put any load on the motor it'll be way too rich. as said, your plugs will be fouled

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