99 corolla problems - Toyota Nation Forum : Toyota Car and Truck Forums

ProbeGT · 09-25-2010, 07:55 PM

Im having 2 odd problems with my 99 corolla for the first one i keep getting codes p0300 and po302 now i know they both for a missfire, but heres where it gets odd. The coils, plugs, wires, injectors have all been replaces.I have tried 3 different ecus. I've also done a pressure chek on the intake. The head was also rebuilt with no change so its not the valves. I'm guessing next is to replace the whole main engien harness since im thinking its gonna be the problem.

The second problem is im having the same problem that gmercoleza had. Is their any more info on if he ever fixed his.
A/C woes :(

Any help would be nice also would anyone know were i could pick up a 98-99 a/t main engien harness

Whiskey · 09-25-2010, 11:52 PM

Is it really misfiring? Like,.. can you feel it miss?

Why do you think it's the wiring harness?

Whiskey

ProbeGT · 09-26-2010, 01:28 AM

Quote:

Originally Posted by Whiskey

Is it really misfiring? Like,.. can you feel it miss?

Why do you think it's the wiring harness?

Whiskey

Yes i can feel it i've been building motors since i was 14 i know its a miss. Sometimes its fine with no miss and then all of a sudden it happens. Unless you know of something else to check im going with the harness, which i also believe will solve my ac problem.

btw ba smiley

EDIT: I almost forgot i also replaced the Crankshaft Position Sensor as well.

ProbeGT · 09-26-2010, 05:11 PM

After doing more searching it looks like gmercoleza problem was also wiring related, also i replace the fuel pump. Now would any one know where i could pick up a 98/99 3sp a/t harness. I checked the for sale section but didn't see anything.

Buurin · 09-26-2010, 09:32 PM

AT harness is part of the engine wire harness. So the same difficulty applies.

ProbeGT · 09-26-2010, 09:37 PM

Quote:

Originally Posted by Buurin

AT harness is part of the engine wire harness. So the same difficulty applies.

Thank you but i already knew that i pulled the harnes befor i posted yesterday. Now im just looking for a 98-99 A3 harness. Would any onme have one or know of some one who has one any help would be great.

ProbeGT · 09-28-2010, 10:15 PM

replaced the harness and the problem went away now just need to figure out the the odd ac problem

ProbeGT · 09-30-2010, 01:47 AM

A/C problem is now fixed the car is now back to normal.

Whiskey · 09-30-2010, 11:21 AM

What fixed the AC problem?

Man,.. the wiring harness was the problem? What an obscure issue to have. Did you find any damage to it when you pulled it out? Cut wires? Worn insulation? Good work on troubleshooting that one.

Whiskey

ProbeGT · 09-30-2010, 12:21 PM

t turned out to be the a/c amp. Yeah after i had the harness out i found 7 wires welded to each other and one being the starter and the a/c so im thinking the system ended up frying the a/c amp when it happenend but the nice thing was i got the harness and the amp for 12 bucks at the junk yard and the harness was perfect.

Whiskey · 09-30-2010, 12:56 PM

Wow! Good find. WA junkyards were so much cheaper than the ones here in CA are,.. in fact so were the AZ junkyards.

Right on! Glad it's working for you now.

Whiskey

ProbeGT · 09-30-2010, 01:16 PM

yeah but cali junks are bigger ive been to one ones down were your at. I also got a clock for the dash.