jonlabree Posted July 13, 2012 Share Posted July 13, 2012 This is a strange occurance, during hard accelleration my engine breaks up. If feels like it is shutting off. I belive it is electrical as the gauges on my dash loose their color lock. ( I have seven color gauges and they are set on green, like the dash.) This only happens on hard excelleration and no other time. I am going to change out my "Accel" coils for the stock one to see if that helps. But other than that I am stumped.Can anyone give me some suggestions?Jon.. Link to comment Share on other sites More sharing options...
Guest Mc_Reatta Posted July 13, 2012 Share Posted July 13, 2012 I'd be checking the fuel pressure first thing to eliminate it before spending time on the ignition. Sounds like what I just went thru on one of mine. Was a weak fuel pump.I'll post another thread with a link to a coupon for a tester in case you need one. Link to comment Share on other sites More sharing options...
jonlabree Posted July 13, 2012 Author Share Posted July 13, 2012 Fuel pressure reads 44lbs on the dash. I think the pump is good. Link to comment Share on other sites More sharing options...
2seater Posted July 13, 2012 Share Posted July 13, 2012 Losing a ground or connection due to engine movement? You could try reducing spark plug gap as a quick check to see if it changes anything. Link to comment Share on other sites More sharing options...
Guest Mc_Reatta Posted July 13, 2012 Share Posted July 13, 2012 Do you notice any difference with temperature? MAFs and ICMs can break down from heat pretty routinely. To truly see what's going on would take an O'scope to see what each output signal is doing as revs go up. Could be a break down of the MAF signal to the ECM and out to the injectors, or the ICM to the coils on to the plugs. Link to comment Share on other sites More sharing options...
2seater Posted July 13, 2012 Share Posted July 13, 2012 MAF would be easy to read in diagnostics. Temperature probably has less effect on it since it is cooled by incoming air and I believe any decent air intake, including stock, will use outside air. ICM/coils certainly are heat sensitive. Link to comment Share on other sites More sharing options...
jonlabree Posted July 14, 2012 Author Share Posted July 14, 2012 2seater, I think you are right. Lossing ground with the movement of the engine. I can't duplicate the breaking up by reving the engine, it only will do it under a load and under heavy accelleration. Link to comment Share on other sites More sharing options...
D-a-n-i-e-l Posted July 14, 2012 Share Posted July 14, 2012 sounds like the supercharger (assuming you are still charged) is possibly wearing. I had one that would do the same thing only under load and full throtle. No odd sounds or any othersymptoms. When I rebuilt the supercharger all symptoms went away. Link to comment Share on other sites More sharing options...
2seater Posted July 14, 2012 Share Posted July 14, 2012 I suppose "breaking up" could be fuel related since each injector will affect a single cylinder (versus carbureted), but it sounds more like a classic ignition problem. I saw a post on another forum about some people experiencing misfires because of poor grounding of the heads. I had never heard of such a thing before, and they were fresh engine builds, so probably unlikely, but? Most of them were engines built using head studs rather than bolts. Adding a ground from head to block cured the problem. Daniel brings up an interesting point. Sometimes the oddest things can cause an issue. I wonder if a rattling s/c could trigger the knock sensor? Easy to watch knock/spark retard in diagnostics. Link to comment Share on other sites More sharing options...
jonlabree Posted July 19, 2012 Author Share Posted July 19, 2012 Well, just so you know, it was a bad coil. Now mind you the coils are brand new Äxcell"coils The top one in the pack was bad. I got lucky when I deciced to change them one at a time because I started at the top. Any way, Problem solved. Link to comment Share on other sites More sharing options...
2seater Posted July 19, 2012 Share Posted July 19, 2012 Good deal. Thanks for letting us know to file away for future "weirdness". Link to comment Share on other sites More sharing options...
D-a-n-i-e-l Posted July 19, 2012 Share Posted July 19, 2012 Glad it was not the charger Link to comment Share on other sites More sharing options...
jonlabree Posted August 4, 2012 Author Share Posted August 4, 2012 UP DATE: It was not JUST the bad coil. In the prosses it caused two of the plug wire to go bad.I replaced the coils (Accel") all of the wires and the plugs. Runs like it did when I first put the engine together. "GREAT" Link to comment Share on other sites More sharing options...
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