NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   -   90 gtu issues (https://www.nopistons.com/2nd-generation-specific-17/90-gtu-issues-64731/)

fcrotornut 03-14-2007 10:35 PM

ok so with my sr240 totaled i got a nice 90 gtu, ok long story short it has a hard time cranking up takes about 4 or 5 good turns with gas depressed to crank over, when it does crank it runs smooth with minimal smoke, it idles rather high at 1300 rpm on top of that, im going to check into the tps and see if i can lower it a tad. ive heard that when theres cranking issues like mine that they engine may be on the way out ?



im somewhat familiar with early 13b's having owned a gsl-se but this s5 seems foriegn compared.

hillbilly 03-15-2007 01:12 AM

well bud, when mine started having cold cranking issues it was because compression was making its way into the water jacket (all started when the alternator went out). but dont count yours out yet! you oughta start by checking the basics: vacuume leaks, compression, fuel delivery, and spark, (theres some good writeups on cheap ways to check all of these effectively) let us know what you find out. the TPS isnt a bad idea, but I dont think it would create hard starting conditions (atleast not like the one you describe) either way, make sure to have plenty of beer handy.*



-Hill



*note: I didnt have beer durring my ol ladys honda crx-to-civicD15 swap and havnt seen my 10mm craftsman combination wrench since. (ok, so I threw the darn thing, but you have been warned)

cosmo90rx7 03-15-2007 04:37 PM

Yeah buddy, had the same problem, except mine had lots of white smoke coming out the tail pipes, it was so much smoke that i couldnt see my car. now it is a matter of rebuilding the motor, 1000 + dollars later. that was after i did like 130 mph on the interstate. so good luck with your 90 gtu cuz my 90 gtu is getting a rebuild.

fcrotornut 03-15-2007 04:51 PM

the thing is, mine doesnt smoke and only smoked when that neck broke.



i found out that its been sitting for around 2 months without being cranked as well.

jwteknix 03-15-2007 05:03 PM

maybe a low or wrong battery with weak cold cranking amps

teknics 03-15-2007 05:30 PM

start with the basics. double check timing, set the tps, check/replace the plugs, change fuel filter, check for vac leaks bla bla bla.



could just be leaky injectors too. my 88 n/a has a cold cranking problem due to a bad ECT sensor, im just lazy and wont replace it lol.



oh and battery too.



kevin.

Siwel 03-16-2007 12:30 PM

When I purchased my T2 it did something similar.. It was just kind of hard to start. I bought a new batt, changed oil, installed new plugs/wires and put in new injectors. I have never had a problem with it since.. Altho I rarely drive it.



It had been sitting for a while when I got it as well.

fcrotornut 03-16-2007 04:28 PM

alot of it settled out, plug were fouled, fuel filter clogged and the idle issue is gone, stays at a smooth and even 900. just gotta fix that coolant level buzzer, its driving me crazy

Leetheslacker 03-17-2007 12:25 AM


Originally Posted by fcrotornut' post='863896' date='Mar 16 2007, 05:28 PM

alot of it settled out, plug were fouled, fuel filter clogged and the idle issue is gone, stays at a smooth and even 900. just gotta fix that coolant level buzzer, its driving me crazy



radiators probably low on water.



my car does this every now and again as i run a little too hot and let some steam out at the track.



itll buzz like mad at me but at the filler nick its full to the brim, but in the radiator its low enough to make the buzzer go off.

fcrotornut 03-27-2007 07:27 PM

still does it and i keep that ho full.



i dont know where all my coolant is going, radiator is full, coolant reserve full... no leaks on the ground and it doesnt smoke, yet ive gotta put collant in it ever 3 or 4 days! what the crap is going on?



it still beeps like crazy!


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