#5 misfire

Asked by Rusty Nov 13, 2018 at 07:38 PM about the 2000 Toyota Tundra V8 SR5 4 Door Extended Cab RWD

Question type: Maintenance & Repair

Let me start over. I'm  sorry  I've  never posted like
this so I'm  going start from the beginning. I have a
2000 ext cab 2 wheel drive tundra. It was running
fine when my starter went out. Now my little truck
has over 300,000 on it so thing are going to wear
out. So after I finally found the starter lol. I
changed it . Bought the gasket kit put it back
together. It fired right up but it was sucking air
around an injector. Well I found a set of injectors  
same thing that in it for a little over $120 on  
Amazon same name brand and part numbers. Now
the seals I found to replace my old ones was $75
for one side. Put the injectors in fired it up had a
miss. So I bought all new coils it needed them
anyway everyone of the old ones had a crack on
them and replaced the plugs with what it calls for.
Still had a miss. So I borrowed a code reader from
a buddy it reads #5 misfire  and some times lean
fuel. Now I ave done all I can think of and what I
thought I figured out from reading forums. I'm by
far a mechanic bit still I can't  afford a mechanic
either. So any suggestions would be greatly
appreciated.  Sorry for the long text I'm new at this.
Thank you for your time!

2 Answers
157,475

Bob answered 5 years ago

You likely would have been able to afford a mechanic if you had not spent all your money throwing parts at it. Also starters and injectors are really not related. Was it running okay before replacing the starter? You should have read the codes before buying fuel injectors. There are a lot of things it could be, but I would start by moving the spark plug and coil from #5 and switching them with another cylinder and reset and reread the code to see if the miss moved with the parts. Makes no difference if the parts are new. If the miss is still present at #5 I might substitute the fuel injector with another cylinder and reset and rescan again to see if the code changed.

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Brian answered 5 years ago

I think the lean mixture is caused by a worn out fuel pump. That may fix the misfire because that cylinder may not always get enough fuel to fire. That's my$.02.

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