Cherokee :: 1993 4.0 - No Voltage At Coil / Backfire Intermittently
Jun 21, 2013
I am having a problem solving a will not start issue with my vehicle. It started running a little rough when stopped, it acted as if was going to stall if it remained in gear. I had to place it in neutral to continue to run. I also noticed a backfire condition that was intermittent sometimes under acceleration. After about three days of this condition now the vehicle will not run. I have checked the fuel pressure and it is within specs.
I found there was no spark @ the spark plugs so I checked the crankshaft position sensor and observed a high value of resistance between terminals B&C therefore I installed a new one. After further checking there is no voltage at the wiring connector that supplies 12V to the coil with the ignition in the on position. I'm not sure what is the correct method in checking for this voltage is. I read that it could possibly be the ASD relay so I tried another matching relay and there was still no voltage at the coil. At this point I am somewhat at a standstill and not sure where to proceed.
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97 SL ATX - Not firing on cylinders 3 and 6; no voltage to that coil.
I've checked:
Plugs
Wires
Coils
PTU
ECU
Timing
So I guess the CAS is the next best guess. So where exactly IS the CAS...and how do i test it? Also, where is the timing mark on the crank pulley? Cams are all aligned but I didn't see a mark for the crank and don't know where I should be looking.
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My 89 Mazda B2600i conked out on me suddenly about 10 days ago. My local mechanic replaced the distributor, cap, and rotor and the ignition coil and now it's running again. But starting it up at the mechanic's, I noticed a new faint sound like a clock ticking rapidly. From under the hood it sounds more like an exposed spark plug firing, but fainter.
After driving around to make sure I wasn't imagining it, I had the mechanic take a quick listen and look. He couldn't say for sure what it was, but said it was probably nothing to worry about.Taking a look under the hood at night, I saw lights running along the spark plug wires (continuous) and flashes of light where the spark plugs insert (frequent).
If one terminal of a volt meter is placed on the outside of the wire running from the ignition coil to the distributor and the other held in the air, the voltage rapidly builds up to 4 volts (a few seconds) and then immediately drops back to zero. This happens in roughly the same time frame as the flashes of light where the spark plugs insert, but I can't tell if it's the exact same frequency. What's going on?
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My '98 4.0 has 213k on it and the other day I started the engine and the jeep started shaking like crazy. Eventually the engine quit and refused to turn over so I looked under the hood and quickly discovered the problem, a deteriorated rubber elbow on the left manifold. The elbow connects to a threaded breather type valve in the manifold and has a thin piece of black plastic routing to the purge solenoid next to the left fender/air box.
When I removed the rubber elbow from the manifold the engine eventually turned over and idled fine, I then headed to autozone and found replacements of the same diameter, I cut them down a bit to match the length of the originals. Since its been a while I changed the plugs and wires, coil pack along with cap and rotor while I was at it. I replaced one plug and wire at a time to ensure I didn't mix things up, same goes for the cap. Now the jeep seems to take a few more seconds to get started but once it does it idles fine.
Now when I hit the gas hard the jeep will hesitate and then backfire. If I'm smooth on the gas the jeep drives good, whether city or highway. When coming to a stop the jeep will sometimes buck slightly like it wants to cut but doesn't. The backfire sounds like its coming from the air box and oddly enough, my aftermarket radio no longer plays in the accessory position, probably a separate issue. So far there's been no check engine light.
I really need to keep this jeep for a few more months and I would hate to put big money into at this stage.
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I have a 1998 JGC. 4.0L motor. Driving it around town the motor would just shut off. Used to do it once in a while....then started happening more and more. I replaced the spark plugs, wires, cap and rotor....thinking maybe it needed a tuneup. Sometimes it restarted right away (right after it quit). Sometimes it wouldn't start until the next day.
So two days ago, daughter was driving it home from work and the motor just quit again. This time it will not restart. Motor cranks over fine. I read on this forum that this is a sign of a bad CPS....although a bad CPS will usually allow you to drive home eventually. So I replaced the CPS. Cranked it over....no change. Now, to check for spark and fuel. I turn on the ignition...I hear the fuel pump in the tank going. Then I pull the coil wire (brand new since I replaced all wires)...and put a spark plug on it....crank the motor....and NO spark. I then pull the wire harness that feeds the coil. It's a 2-prong plug. I turn on the key and nothing showing on the voltmeter.
I then put the volt meter on the battery and it reads fine. So I follow the coil harness connector back...and it just goes into the main engine harness. I then put the OBDII reader to the port in the Jeep and turned on the ignition. I get "Link Error".....so it's not getting a read, but the cigarette light is working...so the port is fine. So no spark to the coil harness and the Link Error does this mean a bad ECM (computer)? Also note that the fuel gauge (and maybe other gauges) are not registering when the ignition is turned on. The check engine light is not on. Maybe security system? I thought a security system failure would turn off spark AND fuel....but I hear the fuel pump running.
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1993 ford explorer sport... I got an error code for a low voltage MAF sensor. how would i go about fixing it? Do i need to get a new MAF sensor?
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Truck is a 1993 ranger 4.0 ohv
Ok I have been getting 157, 158, and 159 codes. I have cleaned and replaced the MAF with no success. I checked the voltage to the sensor 12v, checked the voltage from the signal wire and it is to high. It has been high on the cleaned unit and on both replacements, so I am thinking it is not the MAF, but what will cause it to register high. I cant get the signal voltage below 1.9V at idle.
Signal also reads high with the ignition on and the engine off. What would cause the voltage to be high, I have read it could be an IAC but I would think that would not effect it with the engine off.
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I have a 93 Jeep Cherokee, I just replaced the thermostat and the radiator cap, it's not overheating, however the radiator cap isn't even warming up and the thermostat housing heats up quite a bit.
The hose from the radiator to the thermostat gets very hot, but I don't feel anything being pumped. The coolant is also being drained from the reservoir, but I see little to none leaking underneath the vehicle. I pop off the radiator cap while it's in idle and see no movement and the coolant stays cool.
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Most cars have either an idiot light or a volt meter. This 1995 Buick Park Avenue has both in the same pod. The customer complains that the red light comes on intermittently, but the voltage continues to read just above 13 volts. Sometimes it's dim or flickering, others it's bright. It seems to be more prevalent when the headlights are off, rather than when it is under a heavier load with them or the A/C on. I have not had an opportunity to see the car. It has not failed to start.
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My inline 6 engine softly stutters and misfires while driving and has the check engine light on whenever this happens. It's becoming more frequent now - 20% of the time I'm driving I'd say. The codes are 11, 12, 27, 34. I've looked up the meanings of the codes and I'm leaning towards its bad fuel injectors or a bad connector leading to the fuel rail. I have lots of bad wiring on my 93 Cherokee haha. I've fixed so far: a bad head light connector, and an exposed wire that connects to my distributor - it would swing and touch my engine block causing the engine to die.
But now I am struggling on how to fix my small stuttering engine problem. So the problem only occurs after I make a strong left hand turn such as a 90 degree or a uturn so that means a connection is being pulled to the right. It doesn't have an issue turning to the right though. I don't have sway bars on my 6" lift so there's a reasonable amount of body roll to pull on the wires etc. When I open the hood with the engine running smoothly I can touch and wiggle the front fuel injectors and sometimes I hear it softly misfire or sputter. What connectors lead up to the fuel rail?
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My Jeep GC ZJ 1993 with 202202 miles V8 engine and automatic transmission cuts off/engine shuts down. I have found that when I put it into 2nd or 1st gear it never shuts off. For example, I am driving with AT in D (Drive) and come to a stop, the engine shuts down. However, if I move the selector to 2nd before coming to a stop it never shuts down. BTW it also shudders and headlights dim and battery voltage drops before it shuts down.
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I have recently cleaned my throttle body and still have a rough idle. The rough idle is intermittent and especially occurs when I am in park and then hold on the brake and switch to reverse or forward without pressing the accelerator down and let it sit for a second. When it happens, it is usually so rough it wants to just stall out if I don't give it some gas.
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My oil light keeps coming on when slowing down or at a stop light and goes off when accelerating. We changed the sensor and it still does it. We checked the oil pressure and oil pressure is good. We just replaced the heads due to a cracked head. The light was coming on before changing the heads and still comes on. Why this happens and what is wrong with the car. I am afraid to drive it. There is oil in it and it reads full.
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I have a '95 Pontiac Grand AM. The Heater Coil/Core is leaking onto the passenger side floor. Bad Core. In addition, the car keeps over heating intermittently, whether it's stopped at a light or driving over 35mph out on the road. The gauge goes into the red, but then after a minute it goes back down. We replaced the Thermostat thinking that it was sticking. Drove it around a good 10 mile run. Didn't over heat. Next day, it over heats. Just took it to the garage where they ran it and did compression check.
For over 4 hours they tried to get it to overheat. It wouldn't. They replaced an old radiator cap. They said if that doesn't work, it could be the head gasket (no sign of any fluids mixing - oil cap is clean. No milky residue) or replace the thermostat, which we said we already did. Drove it 2 miles. Started to get hot again. Going to bypass the core to see if this might be the problem. Could there be air bubble from bad core? Not sure if this is the right direction, but I am at a total loss as to what it could be. Pump is running. Radiator fan running.
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Changed my spark plugs and fuel filter but my fuel mileage seems to go down, used to get a average of almost 16mpg on a tank, now I'm down to 13.5mpg and also have the occasional stutter at different speeds/rpms. Is it time for new coils?
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This intermittent no-start problem has been going on for approximately three years. It seems to be related to the fuel pump not coming on. When the car won't start - it will sputter a little then the engine will just turn over (strong battery) but you can't hear the fuel pump. Took it to the Chevy dealer first time and they said it needed a new fuel pump with a $1,200 price tag. We said we wanted to get a second opinion and took it to an independent garage. It's been so long that we forget what he did - but he did not replace the fuel pump.
A few months later - car does the exact same thing again, sputter then no start. Finally we we agreed to replace the fuel pump - so out comes the rear axle, exhaust system and fuel tank to install the new pump. Couple of months later - sputter then no start. Towed back to independent garage again after a few days it started with out doing any work on it. Started every time for the 6 months it sat at the garage. Attempted to replace the anti-theft model with a used one and he could get the car to start at all - reinstalled old module and it started immediately.
Have had the car back for a month and it sputters quite a bit before running. Today, sputter and no start . . . had the car towed back to the house in hope that it will start without intervention like the last time it went to a garage. The security system idiot light does goes off with the other idiot lights. I'm guessing the sputter is the gasoline that was in the system the last time the engine ran - then when no more fuel is being supplied - it won't start. The independent garage says they are reluctant to install a new anti-theft module for fear it won't be the solution.
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My 1993 Maxima at times will not start. There is no rhyme or reason for it not starting. Either that or I have not found a particular reason or reasons for why it will not start. Sometime it is over night and at times it may happen when it sat for a couple of hours. Took it to a garage which they check the battery, starter, ignition switch, starter relay and all was okay.
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