Crazy K Posted May 21, 2009 Report Share Posted May 21, 2009 i want to say... ICM or fuel injector. got a multimeter? you can check two of the injectors without removing much of anything. do that and see what you get. also: check the vacuum line from the regulator for fuel unplug the oxygen sensor and see what happens. if it runs ok with the check light on... it is probably bad. Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted May 21, 2009 Author Report Share Posted May 21, 2009 I just went back to pick my dad up and while I was there, I checked on the car.. It will not start now. It just cranks and smells VERY strongly of gas. I pulled the vacuum line on the FPR and no fuel came out, it seemed to be dry as well. I do have a multimeter. I'll ohm out the injectors and see what I find. I'm thinking maybe CKP sensor.. I'll have to check for spark as well. My buddy Kyle's TGP died EXACTLY like this, and still had spark, but the CKP sensor was bad and not giving the signal at the correct time. Quote Link to comment Share on other sites More sharing options...
ManicMechanic Posted May 21, 2009 Report Share Posted May 21, 2009 My buddy Kyle's TGP died EXACTLY like this, and still had spark, but the CKP sensor was bad and not giving the signal at the correct time. Same as my 1992 convertible had done. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted May 21, 2009 Report Share Posted May 21, 2009 that is possible too. the CXP sensor is a "wear" part in my book. I pull all of mine and inspect, and once in a while I find a crack in an otherwise "good" sensor and replace it. TIP: coat the sensor completely in dielectric/silcone grease to protect it from oil and allow ease of removal if you ever had to pull it again. even if the CXP fixes it, you could still have bad injectors. check it all. Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted May 21, 2009 Author Report Share Posted May 21, 2009 Thanks for the thoughts guys I'll see what I can get done tomorrow..err today.. man I need to get to bed.. Quote Link to comment Share on other sites More sharing options...
Dark Ride Posted May 21, 2009 Report Share Posted May 21, 2009 I'm thinking injectors sounds like how my old GP ran when they were bad. Quote Link to comment Share on other sites More sharing options...
Night Fury Posted May 21, 2009 Report Share Posted May 21, 2009 X3 on teh injectors! thats why my CS PHAILED Quote Link to comment Share on other sites More sharing options...
spiderw31 Posted May 21, 2009 Report Share Posted May 21, 2009 My votes would be either O2, ICM, or injectors (not necessarily in that order though). Someone correct me if I'm wrong here, but I believe that there is a "flood clear" mode that is activated when holding the throttle to the floor while cranking. I was told that if you did this, the injectors wouldn't pulse at all, and the point of it was to clear the cylinders in case the were flooded with fuel. If thats the case, it could help you in two ways. First, it could clear the flood condition and maybe allow the car to start, allowing further diagnosis. Second, if it did nothing and the car still reeks of gas, then obviously an injector is dumping fuel even when not commanded to. Hope some of this is helpful and good luck! P.S. - at least you're not slummin it in the Benz Quote Link to comment Share on other sites More sharing options...
Crazy K Posted May 21, 2009 Report Share Posted May 21, 2009 I believe what spider says is correct. Quote Link to comment Share on other sites More sharing options...
Dark Ride Posted May 21, 2009 Report Share Posted May 21, 2009 I believe what spider says is correct. Really, I never knew that, thats good to know. Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted May 21, 2009 Author Report Share Posted May 21, 2009 there is a "flood clear" mode that is activated when holding the throttle to the floor while cranking. I was told that if you did this, the injectors wouldn't pulse at all, and the point of it was to clear the cylinders in case the were flooded with fuel. If thats the case, it could help you in two ways. First, it could clear the flood condition and maybe allow the car to start, allowing further diagnosis. Second, if it did nothing and the car still reeks of gas, then obviously an injector is dumping fuel even when not commanded to. I tried that last night, and it would not start at all. Quote Link to comment Share on other sites More sharing options...
Crazy K Posted May 21, 2009 Report Share Posted May 21, 2009 I believe what spider says is correct. Really, I never knew that, thats good to know. I think it is a throw back by design... that is also how you clear a flooded carburetor. Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted May 21, 2009 Author Report Share Posted May 21, 2009 I'm going to bring my multimeter and look into it more today and see what I can figure out. I'll replace the CKP since it is cheap, and could use replacement anyway. Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted May 22, 2009 Author Report Share Posted May 22, 2009 I went back and did a bit more investigating.. although it was getting dark out and raining (in AZ?!) I ohmed the injector on the passenger side I could get to without taking the plenum off and it was at 12.2. I turned the key on and let the fuel pump prime, then I went to the schrader valve on the fuel rail and pressed it.. no fuel came out. I had someone else get in the car and turn the key, while I was pressing on the schrader valve.. and fuel sprayed out while the fuel pump primed. I also noticed that just below my intake plenum between the plenum and front valve cover, there is yellow discoloration (gas). I pulled off my intake hose and its dry in there, even after cranking it over. The vacuum line going to the FPR is dry and in good shape, and the previous owner replaced the FPR and the fuel pump on it already. I'm thinking I maybe have fuel injectors stuck open and dumping fuel into my engine... that fuel is going somewhere.. What do you guys think? Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted May 22, 2009 Author Report Share Posted May 22, 2009 bump Quote Link to comment Share on other sites More sharing options...
spiderw31 Posted May 22, 2009 Report Share Posted May 22, 2009 ...I turned the key on and let the fuel pump prime, then I went to the schrader valve on the fuel rail and pressed it.. no fuel came out. I'm thinking I maybe have fuel injectors stuck open and dumping fuel into my engine... that fuel is going somewhere.. What do you guys think? Between this and not clearing the flood with the throttle in the floor while cranking, I'd say yeah it sounds like a stuck injector. Try pulling plugs and see which ones are soaked in gas, and you'll know which injector is open. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted May 22, 2009 Report Share Posted May 22, 2009 ...I turned the key on and let the fuel pump prime, then I went to the schrader valve on the fuel rail and pressed it.. no fuel came out. I'm thinking I maybe have fuel injectors stuck open and dumping fuel into my engine... that fuel is going somewhere.. What do you guys think? Between this and not clearing the flood with the throttle in the floor while cranking, I'd say yeah it sounds like a stuck injector. Try pulling plugs and see which ones are soaked in gas, and you'll know which injector is open. yeah, that would be the simplest way to check... Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted May 23, 2009 Author Report Share Posted May 23, 2009 I pulled the injectors out and checked them for resistance. 12.4 12.3 12.2 12.1 12.1 12.0 What is the acceptable range for these injectors, and how can I tell if they are leaking? Quote Link to comment Share on other sites More sharing options...
Crazy K Posted May 23, 2009 Report Share Posted May 23, 2009 I pulled the injectors out and checked them for resistance. 12.4 12.3 12.2 12.1 12.1 12.0 What is the acceptable range for these injectors, and how can I tell if they are leaking? that is a decent range. you can leak check them by installing them into the fuel rail only, and laying them on top of some paper in the engine valley, and manually operating the fuel pump to see if any leak out the bottom. BTW... new injector O-rings are a MUST, and you should coat them with silcone/dielectric grease(or vasoline) before installing. Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted May 23, 2009 Author Report Share Posted May 23, 2009 Alright, I'll try that. Quote Link to comment Share on other sites More sharing options...
Night Fury Posted May 23, 2009 Report Share Posted May 23, 2009 I just used motor oil on teh CS Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted May 24, 2009 Author Report Share Posted May 24, 2009 Alright I went back and plugged all the injectors back in, flipped the fuel rail upside down, and turned the key... ALL SIX injectors sprayed fuel everywhere! What would cause all 6 to go bad all at once? Or is this caused by something else? I have a video to show it happening as well.. I'll see if I can upload it. Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted May 24, 2009 Author Report Share Posted May 24, 2009 Video of the misbehaving fuel injectors http://s80.photobucket.com/albums/j195/blackswift99/1991%20GP%20SE/?action=view¤t=Video003.flv Quote Link to comment Share on other sites More sharing options...
ManicMechanic Posted May 24, 2009 Report Share Posted May 24, 2009 For some reason, PB videos do not work here. Quote Link to comment Share on other sites More sharing options...
jake91 Posted May 24, 2009 Report Share Posted May 24, 2009 you have to do a direct link Quote Link to comment Share on other sites More sharing options...
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