Subject	HELP! TT sputter and backfire issues. please.
Posted by	JT1237 on July 11, 2014 at 11:19 PM
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Message	Hello, I have a 1990 300zx TT that I got probably a month and a half ago after selling my 350z. Now this car was sitting for a few years so it required a decent amount of work and I am still trying to get this car to 100%. Now I am currently having an issue with my engine.. It has around 100k on it(swapped out to jdmtt-car was originally a tt) and before it sat the timing belt was changed probably 1-10k miles beforehand. The car drops and rises and drops in rpms when i first start it. It takes a few seconds for it to even out and it smells of gas when it's started.. There are no noticeable gas leaks. The engine also sputters or putters whatever you want to call it. It go bumbumbumbubmubmbumbumbubmubmubmbumb like it has a huge cam in it. (The car is obviously missing) And it also backfires after I let off of full throttle at certain rpms in certain gears or after I'm 3+psi of boost. So the a/f ratio is probably wacked. I am wondering what might fix this problem so my car can regain full power. It has clogged cats (which are being removed this week) and my passanger side o2 threw a code once and failed the ecu test. I am replacing that tomorrow morning(hopefully fixes it) Now this is what I have replaced so far. Also cleaning the MAF soon. -Spark Plugs -Fuel filter -Fuel PUMP -Starter(blew out on me) -Throttle position sensor(was all corroded) Also has 15lbs boost jets already in it when i got it. Could it be my CAS? Would that fix my issue? I am not sure if it is an injector problem or not. PLEASE HELP! Any advice is appreciated, thank you so much! (Can provide video if needed)
Follow Ups	HELP! TT sputter and backfire issues. please. - JT1237 23:19:43 07/11/14 Perform boost leak test. (n/m) - dvice 00:46:56 07/12/14 Re: Perform boost leak test. - JT1237 07:05:54 07/12/14 It could, yes (n/m) - dvice 15:45:01 07/12/14 Agree especially if it is on the driver side feeding the - SammybTT(TN) 21:11:05 07/12/14 Gotta do the Basics - Cjw3 08:42:14 07/12/14 hopefully the plugs are NGK's and gapped correctly (n/m) - 300ZMang 11:14:22 07/12/14 my ultimate guess is injectors though - 300ZMang 11:16:47 07/12/14 Re: my ultimate guess is injectors though - JT1237 22:28:22 07/12/14 Your engine is not firing on all cylinders. - ZaXxon 04:33:55 07/13/14 Had exact same problems after timing belt. - ThisIsSparTTa 08:38:57 07/13/14 Re: Had exact same problems after timing belt. - JT1237 19:50:32 07/13/14 I really doubt O2 would cause that - ThisIsSparTTa 09:11:39 07/14/14 Re: I really doubt O2 would cause that - JT1237 22:20:47 07/15/14 Like I said, injectors. - 300ZMang 08:09:14 07/16/14 Re: Like I said, injectors. - JT1237 17:05:54 07/16/14 search "power balance test" - 300ZMang 21:27:45 07/16/14
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