blakefogt's 1987 4Runner Build-Up Thread by blakefogt

4 minute(s) of a 65 minute read

couple issues that I need to clear up whenever I stop being lazy..

1. I see coolant leaking out the bottom of the Throttle Body.. but starting above the hose.. Does this mean the TB needs to be replaced? If so, any thoughts on dropping the 300 and getting the big bore?

2. Upon Initial Cold start up.. (not having run for 2 or so hours) If I don't give it any gas, it will start and die instantly. When if i do give it some blips from the gas pedal it sounds like it bogs down or floods.. Does that sound like the IACV to you? should I just hit up toyota and try to buy a brand new one?

8-16-2011

Alrighty lets get to addressing
Ign I've replaced cap/rotor/wires/plugs all within the last 6 or 7k
Possibly EFI. I don't think it's the AFM in relation to ambient temperature, when i say cold I mean engine cold not ambient cold. um.... fuel filter.. again I would think a clogged filter would be an issue more than just initial start up with a cold engine thanks for all the thinkin materials! I wish I wasn't sick right now, or I'd be out there tinkering.  

OH I have a friend who wants to sell his bug for 750 bucks.. its a 66 says hes driven it to new mexico and back just needs paint.. So Now I'm torn between a cheap ol bug, and a full exhaust for my truck... hmmmm I guess it depends on the quality of the car... if its good I know i can flip it in a month's time.

8-18-2011

Well, I'm feeling better and I drive to work today.. and the ol misfire has decided it needs more attention. blatent at idle... and can be heard felt in nuetral up to about 3k
Driving down the road, I get similar results.. I haven't done a valve adjust since I got the truck... about 15k miles ago so I'm going to start there. All the plugs look typical of 7,000 mile plugs... ordered the gasket, halfmoons and grommets from toyota.. Now I'm just hoping its an exhaust valve adjustment that's allowing air/fuel straight through and popping in the header/exhaust. *finger's crossed* I'm still pretty convinced the IAC-V is acting up due to not enough initial throttle.. couple of ex toyota techs, current lexus techs agree.. so maybe I'm just no good at describing symptoms

1. the start up issue is start die instant no really sputter hence my iacv worries
2.once i get her idling under her own power, about once every... 3 seconds (just a guess) i get a misfire. rev to 2-3 k it will be a consistant.. maybe two pops a second. take of driving and its still doing the same thing.

my current theories
1. faulty iac-v
2. tight valve (according to my dad and family friend both yota techs in the late 80s early 90s) these engines got regular valve adjustments to compensate for them tightening themselves over time. It would make sense that the air/fuel is just passing right through and exploding whenever it feels hot enough.  

but yea doing my research lately, basically just about anything could cause a misfire, and with 25 year old electronics... these sensors can easily develope dead spots and confuse injectors.

my valve cover gasket, half moons, and grommets should be in tomorrow. after work the plan is to replace my bugs fuel pump and do the valve job

onto a bit brighter news. The current plan is, new exhaust from the downey header back (high flow cat) to... unsure of muffler as of yet.  Flowmaster seems like a fine brand... sounds sick on my mom's 5.4L f150

then! save up for the blazeland kit we all drool over