socal85toyota

I havent got to try the new COR yet...should show up in the mail today

ChefYota4x4

iTrader: (5)

Ooooooooooh, .......exciting! But, ....I know, the nerves of "will it solve it" get tweaked a bit, eh? lol.

Even if it's not the 'cause', SoCal, ..... You will at least have narrowed down your "P.O.E."

socal85toyota

Yup, its not for a lack of trying...i'll see what happens

socal85toyota

I put the COR in friday and unfortunately it didnt make any improvements...Changed the injectors on sat and that didnt make any difference whatsoever either. Changed the O2 sensor just for the heck of it too.
Pretty darn stumped now...

ChefYota4x4

iTrader: (5)

Roger, if you stop by, ..... could this be some sort of 'Hot Soak' drama? If so, what do you think would be the cause?

You bypassed the stuff's Roger said in doing your process of elimination, for checking bypass of COR, right, SoCal? I saw he asked, but I thought he was asking that other fella who inserted his issue into your thread........ ???

socal85toyota

Yeah i bypassed the cor with the fuel jumper... maybe its a fuel pressure issue...will the fuel pressure regulator cause hard start issues?

ChefYota4x4

iTrader: (5)

I had typed that question here to Roger... then I deleted it, lol... I think because I was figuring, "Hmmm, the fuel pressure regulator reduces Fuel Pressure to the injectors, then it's increased through the VSV when needed under hot soak conditions".... (Roger deleted his VSV for that, so I guess I'm still not quite sure how that all works, lol).... and I guess what I was thinking was, "Yeah, if it reduces it, then when the diaphram goes out in the FPR, wouldn't it just allow constant higher fuel pressure to the rail?" ... But then, maybe that COULD cause issues, I wouldn't really know, SoCal, ..hmmm. You could delete the vacuum from it for testing purposes. I tested it via vacuum pumps, etc., ....as well as the BVSV, EGR, etc., when chasing my tail on 'rough idle' issues...... and I THINK that when I pulled the vacuum from the VSV to the FPR and plugged it, the idle went up and it smoothed out a LIL bit, ....but I wasn't having hard start when hot issues, etc., so you'd have to try that out. You'd have to block off the vacuum to the VSV and just plug the FPR directly to the plenum, then, also, try just plugging up the vacuum on the plenum that you'd be temporarily using to feed the FPR and try to start when hot w/OUT the FPR in the picture.

???????????? lol.

ChefYota4x4

iTrader: (5)

One of the tests for the FPR when you don't have a vacuum pump is to pull the vacuum line off the FPR above and see if there is fuel in there? I think, because; When the diaphram is failing/failed, it will allow fuel to be pulled right into the vacuum line that's pulling on it.

socal85toyota

I've pulled the line from the FPR and its definately not pullin fuel through the vacuum, seems to be working correctly i guess. When i get my 4runner out of the shop(hopefully this friday...but i doubt it..lol) they are going to take my truck back in and take a deeper look at it... =/
I'll keep thinking in the meantime...Thanks soo much for all of the ideas and suggestions!

ChefYota4x4

iTrader: (5)

My pleasure..... it is just a few things it could be, ......but without having hands on it, multi-meter in pocket, a SOLID 20 YEARS exper. in the Toyota Field..... I can only guess the 'more suspect and common' culprits. I hope you/they get it sussed away with ease!

Just out of curiosity, .... has it been doing this for a while? Or just recently? My buddy is dealing with a 'bad gasoline' issue(we think) that caused literally NO START, PERIOD, for a bit... and hopefully, you both will find it to be something not so expensive or dramatic, eh? (he's just dropped this newly rebuilt one in! JasonTN, poor guy! )

Take care, SoCal, ..... and stay cool man! WOW, it's a scorcher!

socal85toyota

Sure is a warm one today...

My truck has never had this problem before...blew a HG took it to the shop for a rebuild...one of the pistons was chipped also. Got it back from the shop and all is perfect except this starting issue.

socal85toyota

I changed the Coolant temp sensor and it didnt seem to fix anything...next up is the csi time switch...maybe its done for?...ill check the resistance first before a drop $100+ on that. also probably going to throw in a new fuel pump. Crossing fingers once again...

socal85toyota

Ehhh...csi timing switch checked out ok...30ohm cold and 70ohms hot...

I wish i could find something broke or not working!!!!

Same issue still remains...Starts up in a second or 2 in the morning but after its warmed up if i dont start it up immediately after i shut off it takes 4-5 seconds to start up. would the fpr cause such an issue? Almost totally out of ideas...

socal85toyota

Here is the start first thing in the morning...

http://www.youtube.com/watch?v=XTZDYTna_QA [YOUTUBE][/YOUTUBE]



And here it is after warmed up and shut off for about 5 min....

http://www.youtube.com/watch?v=opvkvuhDmLg [YOUTUBE][/YOUTUBE]


Any more ideas?

ChefYota4x4

iTrader: (5)

First Idea, .... DON'T throw more parts at it! I know, it's where we get to when we feel we've tried everything. It doesn't solve things as often as people think. Plus, ..... it's usually 500-600$ later before we stop and, sad to say, take it in to the dealer for a free estimate(for free diagnosis! lol) Even then, I wound up with 3 days at the dealer, ........he couldn't get it figured out!(that was my CAM issue). I ended up with a specialist that knows these OBD1 Juggernauts! lol. (I guess I'd say "Juggernaut with a broken leg!" lol).

Watching the vids, it seems your IACV is working, correct? Looked like 1000 or so RPM when cold.

Did you try what I said, unplugging the VSV for the Fuel Pressure Regulator, plug the FPR directly to the plenum, plug up the line that was pulling vacuum on the VSV, and TRY IT when it's doing "IT"! lol. K? I mean, that's a free next step, ...and it will at least help rule stuff out.(If you did that already, forgive me.... overwhelmed lately, lol)

I'm not sure on wiring possibly being a cause.... but I guess anything is possible(just thinking out loud)......... As you get everything hot in there, it could effect some wiring related to start up.

Just to clarify, SoCal, ..... If, after warming up, you turn the key off and then immediately back on....it will start? Or just, ....after driving or warming it up at all, once you turn it off it wont start right up? Or is it only after 5 minutes of sitting there? (That would happen to me when my COR went out, as we discussed, ....and you replaced, .... but just saying, it was SO FRUSTRATING when trying to get back to a job or something. I often would just leave it running, which is NOT A GOOD IDEA! lol).

Didn't you say that you jumped the fuel pump when it's doing this and IT WOULD START? If not, then I would definitely LOOK INTO the Fuel pump, not necessarily 'go buy one'! lol. Just seems unrelated in that, when cold, it's pumping fuel just fine and starting within a couple cranks. Still seems more 'HOT SOAK' related to me, buddy.

socal85toyota

I have bypasses the vsv before and it didnt seem to help. Once warm/normal op temp, if i shut it off and crank it right back on immediately it fires up(slight stumble/studder for a sec). If it sits after i shut it off for more than a couple minutes it goes back to cranking for awhile till it starts.

At first when i tried the fuel pump jumper i though it helped but when i tried it a couple more times it didnt seem to help. Almost made it feel more rich and stumble a little harder when i started it with that test.

Its going back to the shop next week hopefully monday when the 4runner comes out...ill let them deal with it. im pretty fed up. lol

ChefYota4x4

iTrader: (5)

NOTHING WRONG WITH THAT, DUDE! lol. Seriously, sometimes it helps to have, well, SOMEONE WHO DOES THIS ALL DAY, EVERY DAY, ....let them take a look, eh? lol. Also,... they have scopes, scanners that we don't always have or know how to use.

out of curiosity, ..AGAIN, lol.....

How long has it been doing this? I just have a feeling that, if it's not sensor related, it has to be mechanical/physical issues causing this... Which I GUESS could be something as unexpected as a clogged or kinked line, ..... maybe even the Charcoal filter all plugged up and not allowing back flow of fuel or something? Heck, I don't know.... but SOMEHOW, it'll get figured out, right? lol.

Sorry I couldn't help ya find it more easily, man!

socal85toyota

Yeah i hear ya... I tried. I'm going to ask them to check the compression and make sure they put the timing chain on right...i think wabbit said he had a similar problem when his chain was 2 teeth off and it ran fine when it was started...im not sure. All i know is that it STARTED up fine even with a blown HG before i brought it into the place i got it rebuilt at.Now it runs great but doesnt START great!?!? lol O well. In time... Thanks Mark! you've been nothing but help. Roger as well with a ton of good ideas. Thanks ALL! I'll update when this issue is all sorted out...

OrRunner

iTrader: (1)

Hey man, did you have any luck with this? I am having a similar problem, and was just wondering if you nailed down the issue. I have a bosch fp in right now that I think my be the culprit but I have not check the COR yet, just curious as to you out come!

Jasper 83

I'm curious too after reading this thread. I'm having the same issue as well but I haven't begun troubleshooting yet. A lot of good info and ideas in this thread though. I'm new to the fuel injected 22's so still trying to learn the ins and outs of the efi