spineless Posted January 20, 2006 Share Posted January 20, 2006 I recently noticed that my zxt goes "chug chug chug..." upon exceleration. Is this intake leak, exhaust leak, or non of the above? I also noticed the the performance is not as sharp and the boost does not seem to hold as steady or reach boost as quicky. The only recent changes I have made is a pallnet fuel rail and new injector o-rings. The car ran great after that. boost was holding steady at 9psi and it felt very quick. A few days later on two separate occasions I noticed that my fuel pressure guage maxed out above 60 psi. I realized that the vac line to the fuel pressure regulator was leaking. No more spikes after fixing the leak. Could driving with that much pressure cause a problem? Could there be a problem with the manifold relief valve? Any suggestion would be appreciated. Quote Link to comment Share on other sites More sharing options...
HadesOmega Posted January 21, 2006 Share Posted January 21, 2006 hmm it sounds like you have some kinda leak it should be a smooth sound. Sounds like you got a dead cylinder or something. But I'd have to listen to it myself. Could be an injector, spark plug, headgasket, etc... check your vacuum out to see if its steady. Quote Link to comment Share on other sites More sharing options...
oinojo Posted January 26, 2006 Share Posted January 26, 2006 any news on this? im starting to have the same problem. I have an 82 l28et. Quote Link to comment Share on other sites More sharing options...
AK-Z Posted January 26, 2006 Share Posted January 26, 2006 Could be that the exhaust manifold gasket is leaking. Does sound like a exhaust leak some where. Quote Link to comment Share on other sites More sharing options...
ngrimm Posted January 28, 2006 Share Posted January 28, 2006 I had the same problem with mine. It was the exhaust manifold leaking due to the end studs being broken and the manifold was warped. I hope that's not it because it is pretty time consuming. The bolts are nearly impossible to get out since you can't even see them. It would almost be easier to pull the engine. Good luck, The Grimm Reaper. Quote Link to comment Share on other sites More sharing options...
pallnet Posted February 17, 2006 Share Posted February 17, 2006 Check to see if you have the fuel lines connected correctly. Meaning the FPR after the rail, not before. Don't laugh, I've seen it before. Quote Link to comment Share on other sites More sharing options...
spineless Posted March 13, 2006 Author Share Posted March 13, 2006 Just an update, it looks like it might the an exhaust leask. I found that the manifold stud closest to the front of the car was broken off. Looks like I have a little project ahead of me. What are the chances that the manifold is not warped? How hard is it to get the broken stud out? Any suggestions on how to do that? And yes, the FPR is after the rail. Pallnet, I think I'll be ordering your exhaust manifold stud kit very soon. Quote Link to comment Share on other sites More sharing options...
HeatRaveR Posted March 16, 2006 Share Posted March 16, 2006 Check to see if you have the fuel lines connected correctly. Meaning the FPR after the rail' date=' not before. Don't laugh, I've seen it before.[/quote'] On the barbed fuel rail I had bought from you a couple months ago (I haven't installed it yet), there's hose fitting near the center, aimed away from the injectors, that I thought was for the FPR. If it's not, what's that center fitting for? Quote Link to comment Share on other sites More sharing options...
pallnet Posted July 19, 2006 Share Posted July 19, 2006 "On the barbed fuel rail I had bought from you a couple months ago (I haven't installed it yet), there's hose fitting near the center, aimed away from the injectors, that I thought was for the FPR. If it's not, what's that center fitting for?" Cold start injector. Quote Link to comment Share on other sites More sharing options...
Guest Stony82ZX Posted July 28, 2006 Share Posted July 28, 2006 My mechanic just showed me the problem with my engine. The exhaust manifold must be warped because there are carbon deposits on either end of the head around it. I pulled the two manifolds myself about 6 months ago while I was replacing the exhaust. I changed the gasket and I thought it was all fine because the engine ran beautifully but once I got the muffler put on it was clear that it wasn't alright. It makes a pronounced ticking sound which is the exhaust leak but since it got hot this summer, sometimes it acts up and starts to run really rough, lose power and it sort does sound like a chug chug chug. Im gonna get a new manifold and see what happens. BTW the manifold isn't all that hard to remove from underneath with a regular wrench, having a little mirror helps a lot. Quote Link to comment Share on other sites More sharing options...
Careless Posted July 29, 2006 Share Posted July 29, 2006 My mechanic just showed me the problem with my engine. The exhaust manifold must be warped because there are carbon deposits on either end of the head around it. I pulled the two manifolds myself about 6 months ago while I was replacing the exhaust. I changed the gasket and I thought it was all fine because the engine ran beautifully but once I got the muffler put on it was clear that it wasn't alright. It makes a pronounced ticking sound which is the exhaust leak but since it got hot this summer, sometimes it acts up and starts to run really rough, lose power and it sort does sound like a chug chug chug. Im gonna get a new manifold and see what happens. BTW the manifold isn't all that hard to remove from underneath with a regular wrench, having a little mirror helps a lot. dont get a new manifold. there has to be a way to plane the flange on it so that you can use the one you have. and you should replace the gasket and tighten the bolts in a crosswise pattern, starting from the center, and working your way out, but not tightened all the way, then do it again, and retighten, then go one more time and tighten nicely. don't overtighten nuts or bolts on a head. having them crack off is not very fun to fix, and will force you to deal with a bigger exhaust leak. Quote Link to comment Share on other sites More sharing options...
george.bryant Posted August 4, 2006 Share Posted August 4, 2006 those manifolds are easy to get off. you need a long extension with a short extension on it. jsut put ur fingers in and feel where the bolt is then kinda guide the socket on the extension in... Quote Link to comment Share on other sites More sharing options...
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