ernielist Posted February 17, 2009 Report Share Posted February 17, 2009 My car has a bucking/surging problem throughout the rpm range, it also idles like crap. Heres what I have done to fix it: cap, rotor, plugs, wires, ignition coil fuel filters, checked strainers, checked fuel pump, new fpr, cleaned and flowed injectors, traded injectors for known good ones traded mas for known good unit, checked collant temp sensor, checked ISC, replaced vac hoses, cleaned relays and fusible links cleaned injector clips and associated sensor clips cleaned everything basically alt is putting out juice and batt is good. all IC hoses are connected and good vac advance tested and is good, I am receiving signal from the TBI to advance the vac timing is within limits A friend came over and told me I had the harness on the injectors wrong and I was idling off the secondary, we switched the harness and idles it on the primary it idles better on the secondary so we figured the primary was bad we swapped for a good primary which didnt fix the problem. The thing is when I was idling on the secondary and it started to idle like crap all I would have to do is disconnect my mas and the car would idle on the secondary just fine, can someone please tell me what could possibly be wrong with this car, I have checked everything. The timing is not off in the car because it ran pretty good when I got it and the problem has been getting progressively worse and I am about to lose my mind because I have checked everything and done everything that was recommended and put the recommended parts in the car and it still doesnt run. Help or come buy it. Link to comment Share on other sites More sharing options...
vbrad511 Posted February 17, 2009 Report Share Posted February 17, 2009 What year is the car? Link to comment Share on other sites More sharing options...
ernielist Posted February 17, 2009 Author Report Share Posted February 17, 2009 What year is the car? its an 89 Link to comment Share on other sites More sharing options...
Hoosierquest Posted February 17, 2009 Report Share Posted February 17, 2009 what do the plugs look like? Link to comment Share on other sites More sharing options...
ernielist Posted February 17, 2009 Author Report Share Posted February 17, 2009 what do the plugs look like? i havent looked at em yet, i do know it runs better with a fresh set of plugs, but only for a short time Link to comment Share on other sites More sharing options...
vbrad511 Posted February 18, 2009 Report Share Posted February 18, 2009 Is this from when you start it, and even when it warms up? Pull the vac line off the fuel pressure regulator and see if it's leaking. Check the CTS. Link to comment Share on other sites More sharing options...
Edde Posted February 18, 2009 Report Share Posted February 18, 2009 You sure you don't have some really bad gas? Link to comment Share on other sites More sharing options...
Indiana Posted February 18, 2009 Report Share Posted February 18, 2009 Have you checked the compression yet? I had a car that would not run very long then foul plugs, turn out it had a cracked ring and it was eating the cylinder wall but this is an extreme. Having the car idle on the secondary with the mas unplugged says to me the mas is modding that signal so maybe the tps voltage is off or the tip switch on the idle motor is dead. I thought that you had those injectors cleaned? Bad plugs can cause allot of problems that you may think are something else. Link to comment Share on other sites More sharing options...
Edde Posted February 18, 2009 Report Share Posted February 18, 2009 (edited) Have you checked the compression yet? I had a car that would not run very long then foul plugs, turn out it had a cracked ring and it was eating the cylinder wall but this is an extreme. Having the car idle on the secondary with the mas unplugged says to me the mas is modding that signal so maybe the tps voltage is off or the tip switch on the idle motor is dead. I thought that you had those injectors cleaned? Bad plugs can cause allot of problems that you may think are something else. Yeah I've had a cracked plug insulator once. It'll miss like crazy. As for known good mas - what's that mean? Also on the TPS I wondered if it might have multiple flat spots or something? Edited February 18, 2009 by Edde Link to comment Share on other sites More sharing options...
ernielist Posted February 18, 2009 Author Report Share Posted February 18, 2009 Is this from when you start it, and even when it warms up? Pull the vac line off the fuel pressure regulator and see if it's leaking. Check the CTS. When it was running on the secondary it only did it when it warmed up, but if I unplugged the mas it would stop. Now that I am running on the primary it runs crappy all the time, The FPR is brand new and it has been checked it is good. the cts has been checked and it is within norms I even bypassed it to double check. Any other ideas?? Link to comment Share on other sites More sharing options...
Hoosierquest Posted February 18, 2009 Report Share Posted February 18, 2009 (edited) How did you check your IC hoses for leaks? Is your accordian boot from mas to turbo good? No cracks, splits, tares? Edited February 18, 2009 by Hoosierquest Link to comment Share on other sites More sharing options...
Dan_Brew Posted February 18, 2009 Report Share Posted February 18, 2009 Check your mass. Sounds like it may have gone bad on you. Link to comment Share on other sites More sharing options...
Edde Posted February 18, 2009 Report Share Posted February 18, 2009 Check your mass. Sounds like it may have gone bad on you. Yes. Known good means little unless each function has been tested. Link to comment Share on other sites More sharing options...
ernielist Posted February 18, 2009 Author Report Share Posted February 18, 2009 Yes. Known good means little unless each function has been tested. My IC pipes and all are good. The mas air sensor we used was off of a quest that is running and driving fine. Not to mention that the car idles fine on the secondary until it warms up, then when it warms up it runs like crap, if I kill the mas at this point it runs fine. If I idle it on the primary it runs like crap all the time even if I disconnect the mas. Im confused, I have tried another primary it ran a little better, had that primary cleaned and no luck still ran like crap. I just dont understand why the car runs great on the secondary with mas until warmup? I mean shouldnt it be running rich and fouling everything out? Why would it run great on the secondary with no mas and why would it run good on the secondary until warmup? I thought it was a bad mas too, but the other mas didn't work either then I figured the primary injector was shot. What are the procedures for checking the mas, I will meter it out just to be sure, but once again if it was mas, why would it idles great on the secondary and like crap on the primary even with the mas disconnected? Link to comment Share on other sites More sharing options...
ernielist Posted February 18, 2009 Author Report Share Posted February 18, 2009 How did you check your IC hoses for leaks? Is your accordian boot from mas to turbo good? No cracks, splits, tares? I have a hardpipe from the mas to the turbo Link to comment Share on other sites More sharing options...
Indiana Posted February 18, 2009 Report Share Posted February 18, 2009 Put a fuel pressure gauge on it and get a compression gauge Link to comment Share on other sites More sharing options...
ernielist Posted February 18, 2009 Author Report Share Posted February 18, 2009 Put a fuel pressure gauge on it and get a compression gauge Ok will do. Link to comment Share on other sites More sharing options...
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