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Post by blackandblueracing on Nov 12, 2011 11:28:20 GMT -5
I have an 89 S-10 with a 4.3. Im getting a rich condition at idle, Ive changed the throttle position sensor, idle air control, EGR, MAP sensor, injectors, fuel regulator, computor, and even took it to a shop and they couldnt find it either. it runs great but wont idle, it loads up and dies. It also has a new fuel pump,filter cap, rotor, plugs and wires. Can anyone think of anything Im missing? My next option is the dealer, Ive spent $500 already and it still runs the same. It started all at once, I drove to work and it was fine, had to run to another property and it started the problem.
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Post by bigjosh on Nov 12, 2011 13:11:12 GMT -5
o2 timming or knock sensor
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chally
Junior Member
Posts: 76 
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Post by chally on Nov 12, 2011 14:19:31 GMT -5
Is it a TBI engine? If so did you check the vacuum at the MAP sensor. is it good. I had a TBI years ago that was carboned up in the throttle body and it wasnt putting out good vacuum at the MAP. Lo vac at idle=rich You didnt mention the temp sensor, what is it reading? Grounds?
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Post by sg3526 on Nov 12, 2011 16:40:29 GMT -5
Is it a TBI engine? If so did you check the vacuum at the MAP sensor. is it good. I had a TBI years ago that was carboned up in the throttle body and it wasnt putting out good vacuum at the MAP. Lo vac at idle=rich You didnt mention the temp sensor, what is it reading? Grounds? Good call Chally, if the hose is either collapsed or clogged to the MAP Sensor it will cause a full rich condition because it thinks the engine is under full load. My 94 1 Ton did the exact same thing and when I ran the codes on it I had an open Coolant Sensor circuit. Pulled the connector off the sensor and the terminal was all rusted and broken. Replaced the sensor and the connector good as new. By the way I worked at a dealer for 30 years.. |
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gdog
Full Member
Posts: 198
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Post by gdog on Nov 12, 2011 16:55:40 GMT -5
I presume it is central fuel injection if so they are very prone to internal leakage under connections atop the intake manifold all of the so-called vortec engines were prone to the problem difficult and expensive to fix so much so that some companies created a kit to convert from cfi to port injection I don't know if they were cfi in 1989 but I think so. Gene
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Post by blackandblueracing on Nov 13, 2011 11:37:11 GMT -5
@ bigJosh, has a new O2 sensor chally, it is a TBI motor, vac at MAP is good, but I do get code 33 and 45, 1 is rich cond, and the other is MAP. I replaced the MAP and no change. Is the temp sensor the same one as my guage uses? If so my temp gauge reads the same as it always has 200 at operating temp. It does idle when cold but gets worse as it warms up, Ill try a temp sensor . Thanks for the advice. |
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chally
Junior Member
Posts: 76
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Post by chally on Nov 13, 2011 12:42:13 GMT -5
The temp coolant sensor will not be the one that controls the gauge. The one that controls the gauge will be in the left side head. You want to replace the one that is by the thermostat housing that has the yellow and black wires to it. That is the one that controls the computer functions. Make sure that your grounds are good. Check the one at the thermostat housing and there is probably one the backside of the right head and possibly at the front right side of the engine block down low. Hard to tell without looking at the engine. Im going to go back to this map sensor, you are getting a code, you repalced the MAP and you checked vacuum. Did you actually measure that vacuum and can you tell me what it is? Puttting a finger over it dont count. When its cold and running fine thats because its getting more fuel which is ok but when warm its still putting out the same amount of fuel which it dont need and flooding engine out.
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Post by blackandblueracing on Nov 13, 2011 14:32:54 GMT -5
I changed the coolant temp sensor on the manifold and no change. I dont have a vac gauge but I had it in the shop and they checked it and said it was good. All the grounds are good, one in the back of the drivers side head, the battery is grounded to the block and also from the battery to the body. This thing runs like a bat out of heel, it wont idle thought. I even changed the computor and no change.
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chally
Junior Member
Posts: 76
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Post by chally on Nov 13, 2011 15:00:47 GMT -5
Just for giggles take the TBI off and look where the vacuum comes from for the MAP sensor and see if it is all carboned up. Itll just cost you a TBI gasket but they eventually fail to so it wouldnt be bad to replace it anyway. Caution! Keep an eye out for the little o-rings that are on the fuel lines, dont loose them!
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Post by bigjosh on Nov 13, 2011 16:52:19 GMT -5
check the E G R
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Post by sg3526 on Nov 13, 2011 19:58:13 GMT -5
Check the wiring at the MAP sensor if you have a code 33 I believe that is a MAP sensor code. Have seen several of them break the wires at the connector
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Post by blackandblueracing on Nov 14, 2011 18:13:05 GMT -5
@ Chally, I soaked the TBI in carb tank and thoroughly cleaned it, when I put the new injectors in it. bigjosh, I changed the EGR a couple of months ago because it had a bad gasket. And its been fine up until it started this issue. sg3526, The wires look good, if I unplug the map sensor, sometimes it runs smooth. It turns the check engine light on so it runs in limp mode and its not too rich. The MAP code also says an erratic idle will also give a MAP fault. It has an erratic idle because it loads up. So the MAP code may or may not be an actual fault. As you all can see Im at my wits end with this. Ive change everything that could possibly be the prob, yet it never changes anything. I really need to figure this out, my 3/4 ton 4X4 truck doesnt get the mileage this S-10 gets. And again, Thanks for all the help, its really appreciated. |
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Post by bigjosh on Nov 14, 2011 18:38:13 GMT -5
carbon breaks lose and can get stuck in the e g r valve and make it run like that
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Post by dennismopar73 on Nov 14, 2011 18:51:30 GMT -5
blackandblueracing, try looking on the back side of the engine where the wiring go from motor to (back side of intake ? area)
harness, look for broken or damage wires?? just a guess ,
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Post by davestradtmann on Nov 14, 2011 18:55:48 GMT -5
check fuel return hose could be clogged it happened to me run like shit smelled raw fuel check engine light comes on and would die took it to the dealer.The dealer said it was the return line.
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