Topic: 99 v-6 4-runner hot start stall problem

[jldx4]

  every time when i start my truck and its already warmed up the idle drops and it dies.I plugged it in to a obd scanner and it came up with no codes.I talked to a friend that has a v-6 that does the same thing but every once and a while,he had no idea whats wrong...anyone else had this problem?

[HOODLUM]

My buddies 02 dbl cab had a similar prob the idle didn't drop it would just shut down but same thing no codes would come up and we replaced the TPS sensor.  ?? We replaced it but he didn't have the truck long enough to find out if it was corrected because that same weekend he swamped the whole thing at Paragon park in the tank trap fried the entire electrical system bumper to bumper LOL It could also be a blocked vac switch valve on the vac system or just a line that is not connected prop. Go over all your vac lines and the egr system. it's at least a place to start the elimination process.

[reklund5]

Are you running a K&N or similar oiled-cotton type air filter?

Ryan

[WileEToyote]

Among the "dumbest things I've ever seen" solutions, when my t100 was doing this I picked up a new gas cap at No Auto Parts Available, and it hasn't done it since.  I had rung out all the sensors (fine), checked all the vac lines (fine), cleaned the top end (a little cruddy, but not bad - I wised up to the evils of K&N early and tossed it) - nothin'.  Finally someone mentioned the o-ring on the filler cap, and for $3.99 problem solved.

[jldx4 [OP]]

Are you running a K&N or similar oiled-cotton type air filter?

Ryan

yeah whats the deal with them???

[toyrokcrwlr]

I heard the throttle sensor can get wet and rust the electrical unit inside the throttle sensor and would cause that problem and the best thing to do is get a new one and seal it up good as you can get it.

[reklund5]

yeah whats the deal with them???

The big problem with K&N filters and toyota trucks is that the oil from the filter contaminates the Mass AirFlow sensor in the intake tube.  I see this EVERYDAY at the dealership where I work.  Either the customer over oils the filter, the oil gets sucked off the filter and onto the MAF sensor and then dirt that passes thru the filter sticks to the MAF and screws it all up  -OR- the customer NEVER cleans the damn filter because its a K&N and is supposed to be great.  The dirt then gets sucked thru the filter in mass quantities and fouls the MAF.

Point of my rambling?  Clean the MAF before you throw any more money at it.  To do this, be sure the key is OFF and unplug the harness from the MAF.  Remove the 2 little phillips head screws (and don't lose 'em- they're hard to replace...) and remove the MAF from the intake tube.  GENTLY spray the sensor off with some brake parts cleaner or carb cleaner.  all over the outside and down into the sensor on the little filament wires that are down in there.  The key here is GENTLY.  Then stand it up so the solvent can drain out. Wait about 5 minutes and look down in the sensor with a flashlight.  Still dirty?  Clean some more with a GENTLE spray then stand it up again to let the solvent drain/evaporate and wait another 5 minutes. 

IF it's all clean now, you can re-install the MAF and throw away your stupid K&N filter.  K&N's are great on the street- hell, I run one in my Supra.  But in a vehicle that sees dusty offroad conditions, it's hard to beat the factory filter in the factory airbox.  Your engine will thank you!

Hope this helps! 

Ryan

[jldx4 [OP]]

thanx for your help guys, gonna hafta try cleaning it out,as for the k&N THAT SHIIITTTS OUTTA THERE!!

[MiniSimp]

Clean & adjust your tps sensor and clean all the crap out of your throttle body & intake manifold. Works wonders.

[jldx4 [OP]]

problem fixed--K&N canned!!!!
thankx for the help

[reklund5]

You bet!  Glad to be of some help!

Ryan