Musada Posted June 19, 2010 Share Posted June 19, 2010 1990 Ls 400 121k miles I was on my way to work and had the cruise control set and noticed that it would jerk/hesitate every couple of seconds. but while accelerating it seems to drive fine. when I got to work the check engine light came on. prior to this it was having trouble accelerating....like I would have trouble climbing hills from a complete stop until it gets to third gear.it does idle a bit rough. I got it tuned up back in december and also had some seafoam tran through the fuel system. Quote Link to comment Share on other sites More sharing options...
Musada Posted June 20, 2010 Author Share Posted June 20, 2010 anyone? Quote Link to comment Share on other sites More sharing options...
landar Posted June 20, 2010 Share Posted June 20, 2010 Have you looked at the CEL code(s) yet? They may provide a clue. Here is how to check -> http://www.lexls.com/tutorials/intro/codereading.html Let us know what you find. Quote Link to comment Share on other sites More sharing options...
Musada Posted July 1, 2010 Author Share Posted July 1, 2010 Well i finally took it to get a diagnostic and its got a code 13. They said its misfiring, some of the cylinders aren't firing, and that RPM signal open or short. Don't know what that means. Apparently my transmission needs a rebuild. That the ATF is contaminated with friction materials that have a burnt odor, ICC engagement is harsh and engine misfires and jerks under load. So what do you guys think? Quote Link to comment Share on other sites More sharing options...
curiousB Posted July 1, 2010 Share Posted July 1, 2010 Well i finally took it to get a diagnostic and its got a code 13. They said its misfiring, some of the cylinders aren't firing, and that RPM signal open or short. Don't know what that means. Apparently my transmission needs a rebuild. That the ATF is contaminated with friction materials that have a burnt odor, ICC engagement is harsh and engine misfires and jerks under load. So what do you guys think? Well I would get the engine mis firing and CEL code fixed before ripping out the tranny. That sounds a tad suspect. Along the lines of a service writer trolling for a high ticket repair. ATF will naturally contaminate overtime as friction disks wear out. Maybe a tranny fluid drain and replace would be next step after engine sorted out. Quote Link to comment Share on other sites More sharing options...
Musada Posted July 1, 2010 Author Share Posted July 1, 2010 After doing a couple searches it seems to come down to the camshaft sensor or the mass air flow sensor. Quote Link to comment Share on other sites More sharing options...
VBdenny Posted July 3, 2010 Share Posted July 3, 2010 Whatever you do, don't let them touch your transmission. Maybe when they did the tuneup, they left a wire against a manifold. Look for cheap easy things first, then work your way up. Quote Link to comment Share on other sites More sharing options...
Musada Posted July 10, 2010 Author Share Posted July 10, 2010 well it seems to bad gas. no more sputtering since.i started only using chevron. but now there is another problem. my transmission is pouring transmission fliud out seemingly right after i took it to aamco transmission.for the diagnostic. it didnt even drip before this. you think theu may have did something? where could it be coming from Quote Link to comment Share on other sites More sharing options...
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