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Honda Accord, Electrical, Engine, Coupe, Sedan
Dec 14, 2009 (8:19 pm)
Need some help. Changed the head gasket on our 1990 Honda Accord EX (and let me tell you, what a pain in the a**) Got it put back together, and now it wont start. I need some advice on what to do next. Also, the ECU is setting a trouble code for the throttle position angle sensor, and we cant figure out how to test it properly, so any advice will be welcome. We've got a multimeter, but dont know what setting to put it on (I know its the ohm sign, just dont know what number to put it on) and any readings we get are backwards to what the book says. So any advice will be appreciated. Thanks!
#1770 of 2107 Re: Help with engine [oldschool90]
Dec 14, 2009 (8:41 pm)
Make sure all your grounds are clean and tightly connected. Particularly..........pay attention to the the ground cable going to the thermostat housing.
Does the engine turn over strongly but fails to fire up?
#1771 of 2107 Re: Help with engine [titus_pullo]
Dec 14, 2009 (8:50 pm)
Where is the ground for the thermostat? Yes it cranks pretty strong, and when I tried to start it the first time, it almost started, but then it decided not too. I haven't been able to get the same response since.
#1772 of 2107 Re: Help with engine [oldschool90]
Dec 15, 2009 (8:17 am)
Not sure what your multimeter has for settings but,
Ω setting reads 0-999 ohms resistance, touching the leads together should display near 0
KΩ setting reads 1000-999,999 ohms resistance
MΩ settings reads 1,000,000 ohms and up
The most important thing when making resistance measurements, it's done on UNPOWERERED CURCUITS ONLY!!. You can fry a meter making resistance measurements on powered circuits.
DCV for voltages typically tested on autos, or other things that run on batteries
ACV for voltages typically found in your home outlets
uA, mA, A settings are for reading current draw. Your meter will have one for DC volts and another for AC volts. When reading uA, mA, or A, you need to move the lead from the "COM" jack to the "A" jack on the meter.
If you have an auto ranging meter, you won't have as many settings, just Ω, DCV, ACV, and A, the meter changes to the right range automatically. If it is an auto ranging meter, the display should also show what range it's measuring in, Ω, KΩ, MΩ, or uA, mA, A.
BTW, are you sure you got the timing right on the belt?
#1773 of 2107 Re: Help with engine [oldschool90]
by MrShift@Edmunds HOST
Dec 15, 2009 (8:46 am)
The Throttle Angle Sensor, connected to the side of the throttle body, is a linear potentiometer. It is connected to the throttle shaft. As the throttle angle changes, the throttle angle sensor varies the voltage signal to the ECU. The ECU uses this voltage signal along with the MAP Sensor voltage signal to determine engine load. The typical output voltage at idle is approx. 0-0.5 volts and at wide open throttle approx. 4.5 volts.
You don't measure resistance on this particular TPS. You measure voltage from the right and left terminals of the TPS.
And yeah, you'd better check your timing marks (groan).
#1774 of 2107 Re: Help with engine [Mr_Shiftright]
Dec 15, 2009 (11:26 am)
So the car won't run even if its one tooth off of where the mark is? How do I tension it without losing the marks?
#1775 of 2107 Re: Help with engine [oldschool90]
Dec 15, 2009 (11:28 am)
Look at the thermostat housing...........there is a 10mm bolt with a braided wire attached.
Since you said you did your head gasket.............make sure you didn't put the distributor 180 degree off. That's the only thing you could've disturbed. And do check the timing marks.
Report back with your findings. I always like to start with the simple things first.
#1776 of 2107 Re: Help with engine [oldschool90]
by MrShift@Edmunds HOST
Dec 15, 2009 (12:35 pm)
Probably won't run, or would run badly. Well you said you had the manual, so that should tell you everything about setting timing marks (engine timing I mean, not ignition timing).
You might go over all your tune-up stuff as well.
#1777 of 2107 1995 accord
Dec 16, 2009 (4:44 pm)
what would make 95 accord start to rave very high