Question about 1991 Chevrolet S-10

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91 s10 2.8 tbi tach wire signal.."green"= tach signal

I am unable to obtain a tach rpm signal. Is there an adapter need for the tbi injection 2.8?

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Posted on Jan 02, 2017

tennkntryboy
  • 10 Answers

SOURCE: cant find the iat sensor on 91 s10

The IAT or MAT sensor (as equipped), is a thermistor (resistor which changes value based on temperature) mounted either in the air intake snorkel or the manifold (depending on the application).

Posted on Jan 04, 2009

csmock132
  • 4669 Answers

SOURCE: 91 s10 blazer tach signal wire

Coming off the coil there are two plugs both with two wires. One plug goes to the distributor. The other plug is the one you want. Tie into the white wire. Sometimes you will find a spade connector already hooked to this wire, hook to that.

Posted on May 26, 2009

  • 1632 Answers

SOURCE: 91 S10 2.5L TBI- no fuel spray, did I test this correctly?

put a full bottle of stp injector cleaner in half a tank of fuel and run it . use techron chevron fuel cleaner,
Vitally

Posted on Sep 10, 2009

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3 Answers

Chevy 5.7 liter1995 k1500.truck cranks but no start,there is no spark


If no spark and no fuel injector pulse, I'd want to check for rpm signal? How long since a tune-up? In the diagram the pink wire to coil goes hot with key on.

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Dec 09, 2016 | Cars & Trucks

1 Answer

1988 2.5E s10 no fuel


you mean,cranks ok, but will not start and no fuel , right>?
s10 no fuel. 1988 ( S10 blazer )
please do say , what that means.
1: car cranks and will not start. so must be out of fuel?
(over 50 causes, or better is 10 or less tests (ask)
2: same, and fuel pressure is 0 psi (spec.9-13). gauged.?
3: fuel dribble test?
4: sparks good so tired test fuel and it ran on test fuel ok? proving
loss of fueling>?
5: injector dead cranking, (eyeballs)

which was it?

1988 cars in the USA are BIG TIME TRANSITION year.
we went from CARBS to EFI.
2.5L (what is E)?
gear cam, roller HLA lifters.
your car, USA , is TBI engine,
TBI started on THIS car in 1985 (1/2 and 1/2)
Throttle body injection
an on all TBI engines, one can see it inject with eyes.
does it?
if not it can be the following things.
1: no fuel pressure, 9-13pis.
2: ECU is cutting fuel. Pressure good cranking.
2a: ECU is sending error for bad crank/cam sensors, and cuts fuel.
2b: ECU sees rpm or tacho line dead.
2c. ECU sees TPS sensor output as 4v or more cranking, this cuts all fuel.
3: if ECU is happy, it sends 12vcd to the pump, cranking.
all tests must be dont cranking or chase tail.

Jun 17, 2014 | 1986 Chevrolet S-10 Blazer

1 Answer

Checking tbi injecter voltage


On a 1988 model which should be the same as 87, I show two injectors in the throttle body. Inj 1 has red and blue wires and inj 2 has green and white wires.
The red and white wires should be battery voltage, and the other two are ground signal wires from the computer.

Dec 20, 2012 | Chevrolet Silverado 2500 Cars & Trucks

1 Answer

I have a project jeep I am struggling to figure out. It is backfiring when I get to a high RPM and am assuming I have a problem with my air fuel mixture. It is a TBI (fuel injected), any ideas on how I...


Back fire at a higher RPM?you need to look at the distributor,the internal part, the reluctor may have shifted causing the TBI to fire before the intake,

Nov 08, 2012 | Cars & Trucks

1 Answer

Tachamererter intermit dont work


Tachometer failures are very common on this brand. The tach will tend to hop around first and then just stop.
The most common failure for this concern is a faulty tach in the instrument cluster. This can be checked by using a scan tool to observe the instrument cluster data for the r.p.m. signal, if the scan tool shows a tach signal (RPM) signal then the instrument cluster isn't displaying this signal and is faulty and needs replaced or repaired.

Hope helps.

Mar 01, 2012 | 2005 GMC Sierra

1 Answer

I have an 89camaro irocz 28 with 5.0, with a rebuilt tranny about 3 yes ago. While driving on overdrive at about 40-50 mph it will shift into od geer then back to 3rd then od again what could be causing...


Yes it can be what it is doing is called hunting, As for your RPM tach it has nothing to do with it, Now your transmission is a 4L60 and YES it does need a tach signal or the RPM signal it doesnt matter if your Tach gauge doest work but it need the tach signal for the transmission to work. And NO there is NO VSS it needs TACH. or it will hunt for a shift that is why its doing this.Youll need to restor the TACH to the transmission so it can shift properly, Now youll either have a 4pin connection,1 wire or youll have a 4 pin 2 wire connection or youll have a 4 pin 3 wire connection This transmission need tach signal so bear with me i am going to some how draw it pretend your looking at the switch. connection

l-------------------------------L
I A B I
I C D I Okay the C is TACH that has to work

Apr 23, 2011 | 1989 Chevrolet Camaro

1 Answer

Install tachometer on 3.4 camaro


Most likely you will have to use the tach adapter to get a useable tach signal from the computer.

Mar 18, 2010 | 1995 Chevrolet Camaro

2 Answers

I need to know where to wire the green wire to read RPM's for an aftermarket tachometer install on a 1999 chevy s10 with a 2.2l 4cyl.


It is usually to the positive side of the coil - also depends on what type of distributor cap you have, if there is a 3-4 wire plug that goes to the cap, one of them should be marked TACH

Oct 26, 2009 | Chevrolet S 10 Cars & Trucks

1 Answer

New rebilt carter yfa installed, but idle at 3k all adjustment screws backed out, ? the 2.5 L 4 cylinder came from P O with a jury rigged rochester carb of 77 ford vintage, hard to start so I got the...


The 2.5 L engine is the Pontiac Iron Duke sourced from GM since it was still AMC. They came with Rochester carbs, while Ford used Holley 2 brls on their 4 cyl engines and Chrysler used Carter carbs. You might have the wrong carb and the throttle plates are sticking on the intake manifold. You can try using a carb adapter/spacer. If you drive off road I would suggest buying a TBI throttle body injection system from a junkyard, and pick up a electirc fuel pump. Either new from a speed shop or used from a newer Jeep with a 2.5 L TBI engine, you'll need the computer, harness, relay, sending unit and lines as well. But you can pick up everything at a pick your part yard for cheap (some yards have all you can carry in your hands for $50 days).

Jul 27, 2009 | 1985 Jeep Cherokee

1 Answer

I have 3 codes that showed up in the computer of my 1995 Ford Windstar


Here is the first half of the codes look till you find the one you have
111 System PASS.
112 ACT sensor circuit grounded.
113 ACT sensor circuit open.
114 ACT sensor is out of Self-Test.
116 ECT sensor is out of Self-Test.
117 ECT sensor circuit grounded.
118 ECT sensor circuit open.
121 TP sensor is out of Self-Test.
122 TP sensor input is less than Self-Test minimum.
123 TP sensor input is greater than Self-Test maximum.
124 TP sensor input voltage is greater than expected.
125 TP sensor input voltage is less than expected.
128 MAP vacuum hose damaged or disconnected.
129 Insufficient MAF input.
136 HEGO sensor circuit indicates system lean (Right HEGO).
137 HEGO sensor circuit indicates system rich (Right HEGO).
139 No HEGO switching (Front Side).
141 Fuel system indicates lean.
144 No HEGO switching (Left Side).
157 MAF sensor circuit open.
158 MAF sensor shorted to power.
159 MAF sensor is out of Self-Test.
167 Insufficient TP input change.
171 Lack of HEGO switching (Rear Side).
172 HEGO sensor circuit indicates lean. (Rear Side).
173 HEGO sensor circuit indicates rich. (Rear Side).
174 Check for diluted engine oil.
175 Lack of HEGO switching (Front Side).
176 HEGO sensor circuit indicates lean. (Front Side).
177 HEGO sensor circuit indicates rich. (Front Side).
178 Check for diluted engine oil.
179 Fuel system at part throttle lean adaptive limit, system rich (Rear Side).
181 Fuel system at part throttle rich adaptive limit, system lean (Rear Side).
182 Fuel system at idle lean adaptive limit, system rich (Rear Side).
183 Fuel system at idle rich adaptive limit, system lean (Rear Side).
184 MAF sensor input voltage is greater than expected, in range.
185 MAF sensor input voltage is less than expected, in range.
186 Closed loop injector pulse width longer than expected.
187 Closed loop injector pulse width shorter than expected.
188 Fuel system at part throttle lean adaptive limit, system rich (Front Side).
189 Fuel system at part throttle rich adaptive limit, system lean (Front Side).
193 Flexible Fuel sensor circuit failure.
211 PIP circuit failure.
212 Loss of tachometer/IDM input.
213 EEC SPOUT circuit open.
214 CID circuit failure.
215 PCM detected coil 1 primary circuit failure.
216 PCM detected coil 2 primary circuit failure.
217 PCM detected coil 3 primary circuit failure.
218 Loss of ignition diagnostic monitor signal-left side.
219 Spark timing defaulted to 10 degrees, spark output circuit open.
221 Spark timing error.
222 Loss of ignition diagnostic monitor signal-right side.
223 Loss of dual plug inhibit control.
224 PCM detected coil 1, 2, 3 or 4 primary circuit failure.
225 Knock not sensed during dynamic response test KOER.
226 Ignition diagnostic monitor signal not received.
232 PCM detected coil 1, 2, 3 or 4 primary circuit failure.
238 PCM detected coil 4 primary circuit failure.
241 Ignition control module to PCM ignition diagnostic monitor pulse width transmission error.
244 Cylinder Identification circuit fault present when cylinder balance test requested.
311 Secondary air injection system inoperative during KOER self-test (bank #1).
312 Secondary air injection system misdirected during KOER self-test.
313 Secondary air injection system not bypassed during KOER self-test.
314 Secondary air injection system inoperative during KOER self-test (bank #2)
326 PFE sensor circuit voltage lower than expected.
327 PFE sensor circuit voltage below Self-Test minimum.
328 Exhaust gas recirculation valve position sensor closed voltage lower than expected.
332 Insufficient EGR flow.
334 Exhaust gas recirculation valve position sensor closed voltage higher than expected.
335 PFE sensor circuit voltage out of Self-Test range.
336 PFE sensor circuit voltage higher than expected.
337 PFE sensor circuit voltage above Self-Test maximum.
338 Engine coolant temperature lower than expected (thermostat test).
339 Engine coolant temperature higher than expected (thermostat test).
341 Octane adjust service pin open.
381 Frequent A/C clutch cycling.
411 Cannot control RPM during KOER low RPM check.
412 Cannot control RPM during KOER high RPM check.
415 Idle Air Control system at maximum adaptive lower limit.
416 Idle Air Control system at upper adaptive learning limit.
452 Insufficient input from VSS.
453 Servo leaking down.
454 Servo leaking.
455 Insufficient RPM increase.
456 Insufficient RPM decrease.
457 Speed control command switch(s) circuit not functioning.
458 Speed control command switch(s) stuck/circuit grounded.
459 Speed control ground circuit open.

Jan 15, 2009 | 2001 Ford Windstar

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