I AM GETTING A HEAVY BROWN DEPOSIT IN MY THROTTLE BODY. IT IS PASTE LIKE AND CRUMBLES WHEN WIPING IT FROM AROUND MY TBI BORES. IT HAS ALSO CLOGGED MY EGR AND MAP VACCUUM LINES. MY INJECTORS SEEM TO BE SPRAYING TOO MUCH FUEL. AND GAS MILEAGE HAS DROPPED TO 12 FROM 18 MPG. I ALSO HAVE UNPLUGED MAP TO MAKE IT RUN ( OFF OF TPS SENSOR) BECAUSE MAP ISNT WORKING PROPERLY WITH NO VACCUUM OUT AT TBI PORT..

ALSO.. WHAT IS A GOOD SPRAY PATTERN.... I AM SEEING DRIPS SOMETIMES FROM CENTER OF INJECTOR AND THE INJECTOR TIPS ALSO HAVE THIS CRUST LIKE VARNISH ON THE TIPS..

I HAVE TRIED CLEANING WITH CARB CLEANER BUT NOT MUCH LUCK!!!

 

Hmmm.... You definetely have a strange problem. I am not sure what it is, but I do have a possible idea what it could be.

When was the last time you changed your fuel filter? It is very possible that it is bad, as well as the filter screen inside the tank for the pump. It is possible there is rust inside the tank, and running through a bad filter and screen, it is making it's way to the injectors. It's just a theory though, but I know my screen was pretty rust colored when I changed fuel pumps.

Your bad gas milage is obviously do to the plugged vacuum lines and lack of a map sensor.

A good spray pattern is that of a cone, with no drips. Deposits are definetely a bad thing.

How long has it been doing this? I guess it is possible that somebody may have put something in your tank as well/

 

THANKS FOR INFO: JUST REPLACED FUEL FILTER AND COMPLETE NEW FUEL SENDER /PUMP ASSEMBLY IN DECEMBER.

 

ACK! What brand of gas are you using? Theres obvously something bad in that gas that leaves horrendous deposits. All gas will leave a little varnish around the nooks and crannys of the intake and a touch on the tips/walls but thats extreme! either that or someone really hates you and they're dumping something in the tank.

EDIT: It could also be exaust/blowby/burned oil that makes its way back into the intake via the egr. I had this happen with an old 1.8L eclipse. Had to pull the plenum to clean everything out and open the vacuum passages back up. Left deposits all the way back to the throttle body. Its extremly unusual to see it on the injectors, though. Usually the only components affected are the IAC and the vacuum ports. They get that exaust and old gas crust on them after awhile.

 

Your MAP sensor definately needs to be plugged in and functional!

Good luck!
Tony

 

Oh, as for cleaning, youll ahve to remove the tbi to clean it. once off, you can use something to clean the passages or soak the base in solvents to remove the crap. Youll also probably want to remove the pintle from the IAC and clean and reoil it as well as the guide so it wont stick or get sluggish in the future. Id does kind of sound like your engine might have a blowby problem. The PCV will pick all that burned oil blowby/exuast/oil out of the crank case and itll get sucked into the intake tract.

 

First off, Take off caps lock before I kill you.

Secondly, you caused your own problem by disconnecting your map. The brown deposits could be alot of things, dirt from unfiltered air leaking past the aircleaner, to excessive blowby into the aircleaner from the breather.

Thirdly, welcome to the internet, you are about 10 years behind the rest of the country.

 

i know this should be tech related, but ffs, what is the deal with ppl and those caps? sorry mods, but thats why ignored him in the 1st place.

 

I dont think yelling at him is going to accomplish much.

Ive had the same problems with other cars where the engine, which is in poor condition, will cause lots of deposits. The only way to fight it is to remove the tbi and give it a good soak and cleaning to remove all the deposits.

While disconnecting the map isnt recommended, it wont cause horrendous fueling problems on a stock engine. If you do have issues with vacuum, though, the map can cause a feedback loop that causes the engine to run very rich. Although I suspect its probably a problem with severe blowby causing gasses in the crankcase to make their way back into the intake and tbi. I dont know if theres much that can be done. Disabling the PCV system will cause the problem to get much worse since the crap will just sit in the engine and plug everything up. Also, check to make sure that the PCV valve is still functional. If its not, that will cause the gasses to revert back into the air cleaner.

 

ok...........caps off.......
update: fyi. i have unplugged the map because it was not working at all due to plugged vaccuum line from deposits...

this car has a new fuel pump/sender unit in tank.. the car will not run very good at all with map connected because the map is not sending any signals to the ecm.

the deposits formed before map sensor and egr stopped working due to clogged vaccuum lines.

the idea to disconnect map came from test charts in chiltons as a way to force the car to get signal for injectors from tps sensor.
with the map connected the car jerks and stalls and black smoke out tailpipe.
with map disconnected the car runs a lot better but slightly rich.

until i solve the deposit problem and unclog the egr and map vaccuum lines they are not going to work.

the deposits are forming around the spray pattern of the injectors and look like gum and varnish.

has anyone rebuilt their injectors???
how difficult is this??
what about fuel pressure regulators on tbi

 

What brand of gas do you use? Does the engine have good compression? Does it burn oil? The injectors seldom clog. If you want to clean them, remove them and soak the tips of the injectors in solvant. If they still look cruddy inside, take a toothbrush and work some of the bristles into the nozzle real good, thatll dislodge any garbage that might be in there. The car running poorly with the map plugged in may be a sign of vacuum or tuning problems. Evidently, the MAP has enough vacuum to function if the computer doesnt trip an error code. Check to see how much vacuum the engine pulls at idle. If it looks like its pulling at least around 17 inHg, the engine has had a tuneup recently, and it doesnt burn excessive ammounts of oil, then its time to clean the tbi. Also make sure that your pcv valve is connected and working properly. That could be the cause of your deposites right there. Dont forget to replace its filter as well.