90 celica gt "wild celica is bucking" spuddering and over-heating

[Faye]

Anyone have an idea of why my 90celica gt sputters when sitting still, it sounds like it is going to cut off, rpm is really low when ideling and it over heats; one rad hose is hot and the other is cold, what is up with that (new filters, new spark plugs, new distributor cap, new thermostate, fan switch, fan motor and sensor). It also bucks when accelarating and hesitate with a jerkyness while maintaining speed. I'm sure all this is goining to cost me big bucks so any help would be greatly appreciated, I don't want to take it to the shop without knowing what some of this stuff might be, being a female I will get screwed big-time.

[Pineapple]

Too many possibility. Bad ignition coil, blown head gasket, really worn piston rings, bad ignition timing, bad or missing ground wire, bad fuel pump, plugged fuel filter etc.

[turbo_GT]

you might have a clogged up rad...since you said one end gets hot..and the other is cold....it's not going through...

[Domklz]

Hi Faye,
The above fault could always be caused by a clogged rediator.
When you go to the shop ask them to thouroughly check your cooling system.
Kind Regards
Domklz

[fiveyearzen]

Sounds like the MAP sensor. To find out if it is, you need to disconnect the vaccum hose from the MAP sensor. If the engine stabilizes, then you need a new one. The MAP sensor is about an inch wide, round with a plug, and the vaccum hose attatches to the bottom. It is bolted onto the firewall, roughly in the middle. I had this problem with my 91 celica and had to purchase a new map sensor. About two months later, my rings went and burned the engine up. Go figure. So I scrapped the car, but pulled some parts before I did. The MAP sensor was one, so I have one if you need it- part number 89420-20190

[speedyts49]

Did it start doing this before you worked on it? On occasion I work on one thing and mess something else up.
I knocked a vacuum hose loose once and did not know it. A lot of looking around and I finally found it.
Just a thought.

[90celicaGT-S]

my car has the bucking problem as well i thought is was the tranny. cause i filled it up with fluid and it stopped for a while but then it started again and now filling it up doesnt help. it only rattles when accelerating quickly though. and a little when it shifts into 2nd its an automatic.

[tenderfoot]

Originally Posted by fiveyearzen

Sounds like the MAP sensor. To find out if it is, you need to disconnect the vaccum hose from the MAP sensor. If the engine stabilizes, then you need a new one. The MAP sensor is about an inch wide, round with a plug, and the vaccum hose attatches to the bottom. It is bolted onto the firewall, roughly in the middle. I had this problem with my 91 celica and had to purchase a new map sensor. About two months later, my rings went and burned the engine up. Go figure. So I scrapped the car, but pulled some parts before I did. The MAP sensor was one, so I have one if you need it- part number 89420-20190

I may need that map sensor. How much do you want for it?
tenderfoot

[waoonetwork]

Originally Posted by fiveyearzen

Sounds like the MAP sensor. To find out if it is, you need to disconnect the vaccum hose from the MAP sensor. If the engine stabilizes, then you need a new one. The MAP sensor is about an inch wide, round with a plug, and the vaccum hose attatches to the bottom. It is bolted onto the firewall, roughly in the middle. I had this problem with my 91 celica and had to purchase a new map sensor. About two months later, my rings went and burned the engine up. Go figure. So I scrapped the car, but pulled some parts before I did. The MAP sensor was one, so I have one if you need it- part number 89420-20190

I know its been some time but if you still have that MAP Sensor how much do you want for it?

[RobMilkshakes]

I really doubt they'll reply. You can check around in our parts for sale forum or even pick up a few at a local pick-and-pull yard (if you have any) for usually rather cheap if you're not looking to pay for a brand new one