Idle hunting SR really bad - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

TheRealSy90 · 01-04-2018, 08:48 AM

Cracking the throttle plate is not correct. The reason it stumbles coming down to idle is when the BOV is not recirculated post MAFS.

NiSilS14 · 01-05-2018, 03:53 AM

Quote:

Originally Posted by TheRealSy90

Cracking the throttle plate is not correct. The reason it stumbles coming down to idle is when the BOV is not recirculated post MAFS.

Perhaps cracked is the the wrong terminology, not to the point where the TB is visually open. Throttle stop screw still needs to be set, and not completely backed out of use. I adjust it to where i'll start feeling resistance from the throttle blade, making sure the throttle body is not sticking closed. These cars are old and the electronics sometimes aren't what they once were, so they do need periodic adjustments. Aside from that, I've seen a bad maf + o2 sensor on one car give similar symptoms. Other than that, I can only see a intake leak giving the same issues. Both of which op stated were either replaced or tested. Is there a boost/vac gauge in the car? what kinda vac reading do you have around idle?

ImThatGuy · 01-05-2018, 06:04 AM

I will have to double check what the vac is at idle. I should be able to check either this afternoon or this weekend sometime.
I work in the shop my car is in so running it early morning and then dealing with the exhaust all day is a bad idea. To cold here (-16 degree F) right now to ventilate after running. I hate winter

Bcombs14 · 01-05-2018, 06:24 AM

Timing off a tooth

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ImThatGuy · 01-06-2018, 07:17 AM

Quote:

Originally Posted by Bcombs14

Timing off a tooth

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Ive verified the CAS and timing is 100% spot on. If there is one thing on a SR motor I am a champ at doing, its the timing setup.

Its the timing when the car takes over using the ecu that gets me until I was explained how to fix this issue via this thread.

ImThatGuy · 01-16-2018, 06:15 AM

No recent updates. Hoping this week to be able to check coolant lines and run the car again

Kingtal0n · 01-16-2018, 09:23 PM

These engines are so simple. You compression test, boost leak test, timing verify. Then put good maf good injectors good ecu and fuel pump, bkr7es copper plugs and it runs. I've never seen an exception.

throttle body shut, holding water is factory goodness. coolant lines on the iacv for warm-up idle is proper. but neither of those things, nor the tps, can cause it to run badly. Shut off at random or idle too high, sure. but it will drive great still, with a bent throttle body blade and a broken IACV.

!Zar! · 01-17-2018, 01:03 AM

When did this issue start?

ImThatGuy · 02-05-2018, 07:31 AM

Took some time off due to weather. It still sucks here in the Chicagoland area but I have been plugging away little by little.

Issue originally started when enthalpy tuned ecu had plastic ribbon and it failed, frying my wiring harness. Since then the car was put away and forgotten about.
New ecu, new harness and issues are slowly going away. I had made such major changes to everything "to make it run" when the harness and tune were bad that is super way outta wack

Dialing things back in now

Update:
All new intercooler couplers and PCV valve installed. Waiting to run car once I get a break in the weather.

92SEric240sx · 02-15-2018, 06:53 PM

Is your fuel line reversed or kinked

Bcombs14 · 02-15-2018, 07:50 PM

Quote:

Originally Posted by 92SEric240sx

Is your fuel line reversed or kinked

If it was reversed it wouldn’t run at all

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01-17-2018, 01:03 AM	#38
!Zar! Post Whore! Join Date: Nov 2004 Location: North Korea Posts: 14,579 Trader Rating: (27) Feedback Score: 27 reviews	When did this issue start? __________________

02-15-2018, 06:53 PM	#40
92SEric240sx Zilvia Addict Join Date: Aug 2006 Location: The VA Posts: 620 Trader Rating: (32) Feedback Score: 32 reviews	Is your fuel line reversed or kinked __________________ RELAX BRO!!!!

01-05-2018, 06:04 AM	#33
ImThatGuy Leaky Injector Join Date: Nov 2017 Location: illinois Posts: 60 Trader Rating: (0) Feedback Score: 0 reviews	I will have to double check what the vac is at idle. I should be able to check either this afternoon or this weekend sometime. I work in the shop my car is in so running it early morning and then dealing with the exhaust all day is a bad idea. To cold here (-16 degree F) right now to ventilate after running. I hate winter

01-05-2018, 06:24 AM	#34
Bcombs14 Zilvia Member Join Date: Apr 2013 Location: Somerset, KY Age: 31 Posts: 206 Trader Rating: (0) Feedback Score: 0 reviews	Timing off a tooth Sent from my iPhone using Tapatalk

01-16-2018, 06:15 AM	#36
ImThatGuy Leaky Injector Join Date: Nov 2017 Location: illinois Posts: 60 Trader Rating: (0) Feedback Score: 0 reviews	No recent updates. Hoping this week to be able to check coolant lines and run the car again

01-16-2018, 09:23 PM	#37
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 41 Posts: 4,828 Trader Rating: (17) Feedback Score: 17 reviews	These engines are so simple. You compression test, boost leak test, timing verify. Then put good maf good injectors good ecu and fuel pump, bkr7es copper plugs and it runs. I've never seen an exception. throttle body shut, holding water is factory goodness. coolant lines on the iacv for warm-up idle is proper. but neither of those things, nor the tps, can cause it to run badly. Shut off at random or idle too high, sure. but it will drive great still, with a bent throttle body blade and a broken IACV.

02-05-2018, 07:31 AM	#39
ImThatGuy Leaky Injector Join Date: Nov 2017 Location: illinois Posts: 60 Trader Rating: (0) Feedback Score: 0 reviews	Took some time off due to weather. It still sucks here in the Chicagoland area but I have been plugging away little by little. Issue originally started when enthalpy tuned ecu had plastic ribbon and it failed, frying my wiring harness. Since then the car was put away and forgotten about. New ecu, new harness and issues are slowly going away. I had made such major changes to everything "to make it run" when the harness and tune were bad that is super way outta wack Dialing things back in now Update: All new intercooler couplers and PCV valve installed. Waiting to run car once I get a break in the weather.