V6F1R3BRD

My car is a mpfi 2.8. i have changed plugs, wires, dist. cap & rotor, fuel filter, some of the vaccum lines, and and intake sensors.

I was just wondering if a bad O2 sensor or a dirty one would make a car idle a little funny? i still have yet to set the timing correctly and i KNOW thats an issue.

tony_cogliandro

iTrader: (3)

have you searched the obdI codes yet?
GM 1983-95 vehicles OBD1 codes self-retrieval

As the name implies, you can get the codes for GM cars or trucks yourself if the model of your vehicle is made before 1995, this means as soon as you see “check engine light” in your dash, you can get the code in minutes if you want.
Shown on the left is a picture of the connector where you get the GM OBD1 code.



When you find the adapter connector, use a jumper wire (see red wire above) and connect terminals A and B. Next turn your key on but don't start. Watch your check engine flash the code/s.
EXAMPLE: CODE 12: one long flash and two short flashesCODE 13: one long flash and 3 short flashes. Note: code 12 is usually the first code you get and just ignore it.Watch the code after code 12, that's what you need.
here are the common codes:
GM common codes for OBD1 (for vehicles made before 1995)
12 System normal
13 oxygen sensor circuit open
14 coolant sensor high resistance or shorted
15 coolant sensor circuit low or open
16 direct ignition system (DIS) fault in circuit
17 cam position sensor fault
18 crank or cam sensor error
19 crank sensor circuit fault
21 tps sensor out of range
22 tps sensor signal voltage low
23 intake air temp sensor out of range, low
24 vehicle speed (vss) sensor circuit fault
25 air temp sensor sensor out of range, high
26 quad-driver module (computer) circuit #1 fault
27 quad-driver module (computer) 2nd gear circuit
28 quad-driver module (computer) circuit #2 fault
29 quad driver module (computer) 4th gear circuit
31 cam position sensor fault
32 egr circuit fault
33 map sensor signal out of range, high
34 map sensor signal out of range, low
35 idle air control sensor circuit fault
36 ignition system circuit error
38 brake input circuit fault
39 clutch input circuit fault
41 cam sensor circuit fault, igntion control circuit fault
42 electronic spark timing (EST) circuit grounded
43 knock sensor
or electronic spark control circuit fault
44 oxygen sensor lean exhaust
45 oxygen sensor rich exhaust
46 pass-key II circuit or ps.pressure switch circuit fault
47 pcm-bcm data circuit
48 misfire diagnosis
51 calibration error, mem-cal, ecm or eeprom failure
52 engine oil temperature circuit, low temperature indicated
53 battery voltage error or egr or pass-key II circuit
54 egr system failure or fuel pump circuit low voltage
55 a/d converter error or pcm not grounded or lean fuel or frounded reference voltage
56 quad-driver module #2 circuit
57 boost control problem
58 vehicle anti-theft system fuel enable circuit
61 a/c system performance or degraded oxygen sensor signal
62 engine oil temperature high temperature indicated
63 oxygen sensor right side circuit open or map sensor out of range
64 oxygen sensor right side lean exhaust indicated
65 oxygen sensor right side rich exhaust indicated
66 a/c pressure sensor circuit low pressure
67 a/c pressure sensor circuit or a/c clutch circuit failure
68 a/c compressor relay circuit failure
69 a/c clutch circuit head pressure high
70 a/c refrigerant pressure circuit high
71 a/c evaporator temperature sensor circuit low
72 gear selector switch circuit
73 a/c evaporator temperature circuit high
75 digital egr #1 solenoid error
76 digital egr #2 solenoid error
77 digital egr #3 solenoid error
79 vehicle speed sensor (vss) circuit signal high
80 vehicle speed sensor (vss) circuit signal low
81 brake input circuit fault
82 ignition control (IC) 3X signal error
85 prom error
86 analog/digital ecm error
87 eeprom error
99 power management

V6F1R3BRD

well if i knew what that meant.. im guessing get one of those code scanners? its my first.. well technically 3rd car (long story) and im just about a complete noob.

V6F1R3BRD

wow lol.. Why spend money on overpriced equipment?
thanks man.

tony_cogliandro

iTrader: (3)

you dont need a scanner - look at the diagram - the check engine light will flash - and give you the code.
you just need to connect the A & B with a paperclip or something like that.
i presume that you can see flashing lights. and i also presumt that you can count to 10 -
long flash is 10 short flashes is 1.
just look at the top of the chart.
i also presume you can afford one of those high priced paperclips.

procedure 1
now you think it might be the oxygen sensor - so here is my suggestion - get the car up on jacks - slide under - pull the oxygen sensor - or lift the hood and bang your knuckles up on the hot exhaust - finally get it out - if you are lucky maybe you could strip the screws - - look at it - guess if it is working - get in another car and drive to the parts store and ask them if they have it or can check this one out - come back put it in and still not be sure if its the right problem. estimated time - 3 hours.


procedure 2
or YOU CAN USE A PAPERCLIP AND SEE IF YOU GET A LONG LIGHT AND 3 SHORT ONES - which will tell you if you have a bad oxygen sensor - would take about 10 minutes and have a beer.

no i think you want to do procedure 1.

mtwlkn122

As Tony_ already stated at the top of his post you put a jumper wire between A and B and it will flash codes on the dash. For example the number 12 will flash first 3 times showing you that the system is working right then it will show trouble codes present, then start over. It wont SHOW A # 12 tho! It will flash like this to show a 12....*flash*.......*flash**flash*.....................*flash*.......*flash**flash*....and so on....get it?....after checking your codes tell us what you get. My guess is start with this.... -check for codes first(and fix according) -check order of wires -check timing -check vacuum pressure or just check for bad lines with the starter fluid technique -check fuel pressure -if all fails replace the common maintenance sensors if all of that doesnt fix it...let us know....if it does fix it let us know also tho. Its good to hear peoples success stories.

tony_cogliandro

iTrader: (3)

you try to help some people and they just want you to give them the answer and not do the work.

like going into a doctors and say "doctor im sick what is wrong with me" and not letting him test you.

lol

here is a cheap one for 29.00 http://cgi.ebay.com/ebaymotors/OBD-I...mZ180150057805

i bought mine years ago for about 30.00

here is another site with codes a little more detail http://www.freeautomechanic.com/diag...blecodes5.html

that last one is pretty kool - lots of nice things to look at.

mtwlkn122

haha ya....oh well...ill continue to get on here everyday and try to help people out

tony_cogliandro

iTrader: (3)

here is something else i found

V6F1R3BRD

no need to make assumptions. lol id much rather use a paperclip. its a simple concept so you dont need to reiterate.. but i appreciate the help. i mean i never said i didnt want the help..

and mtwlkn122 dude ive checked all of wht you stated except fuel pressure. so ill try and do that soon. but like i said im a nub..

o and if its the TPS would an oem replacement be set correctly? ill search on how to adjust it.

V6F1R3BRD

ok well i just checked my codes..

First attempt- kept getting 12 over and over.

Second attempt- 12 13 12 12

and is the fan supposed to come on?

and you said 12 is system normal, i liked that. but since 13 came up once and never came back i was a little confused..

i think im gonna pull the o2 out and just see if its caked black or not. my car seems like its been running rich. maybe just try unplugging it and see how she does.