Sr20det red top problem!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ll_EvOluTIoN · 02-18-2011, 07:49 AM

So just did my swap and I'm having an idle problem. It seems to be idling around 1000rpm(tach nonop) then it seems to cut out for a sec. I was checking the injector pulse with test light and when the engine cuts out the injectors stop pulsing.

I checked tps adjustment an it's at .4v. I'm getting spark at all plugs. New spark plugs n gas. New stock injectors spray great. I switched between 3 ignitor chips n same prob. Switched in known good ecu. Same prob.

Any ideas of what it could be?

Sileighty_85 · 02-18-2011, 08:44 AM

check ECU for Codes
If you dont know how, Search on how to do it

Kingtal0n · 02-18-2011, 06:44 PM

I am the last person to suggest a maf problem but from the sounds of it (replaced ecu, replaced igniter, missing injector pulse suddenly...) it sounds like a maf issue. maybe the maf plug is loose or vibrating a bit? CAS could also be culprit as you did not mention whether spark cuts out or not. if pulse and spark dissapear then CAS/Wiring/ECU related. if just pulse then MAF probable. Because the plugs will fire as the engine rotates regardless of maf signal (right???!)

Vatche · 02-18-2011, 07:26 PM

i would also reccomend checking the wiring on your maf, loose wiring or bad solders can cause that

ll_EvOluTIoN · 02-19-2011, 03:12 AM

Thanks guys. Harness is brand new I'll check to make sure I'm getting correct voltage. Oh and timing is dead on lined up just in case u guys were wondering.

ll_EvOluTIoN · 02-19-2011, 03:36 PM

Ran codes n got 55. Checked tps it's .48v-3.8v wot. Maf is .8v key on engine off. Don't hap rpm signal do not sure if this helps but 2.8v when its idling. 3.7v at wot engine on. My vacuum/boost guage fluctuates from 4hg to 6hg wile idle goes up n down. When I rev it boost goes to about 5-6psi. So I dont think it has a boost leak.

ll_EvOluTIoN · 02-22-2011, 11:22 PM

Bump any help?

ll_EvOluTIoN · 02-28-2011, 07:36 PM

So the injectors are cutting out. I tried a new tps n it fixed the idle for 5 min n did the same. So put a new maf and the problem goes away untill I hit the throttle. Then idles bad again. Now today no matter what I do it idles bad. Here's what I got.

YouTube - Sr20det problem

02-18-2011, 07:49 AM	#1
ll_EvOluTIoN Zilvia Member Join Date: Jan 2005 Location: Elk Grove, Killa Cali. Posts: 277 Trader Rating: (1) Feedback Score: 1 reviews	Sr20det red top problem!! So just did my swap and I'm having an idle problem. It seems to be idling around 1000rpm(tach nonop) then it seems to cut out for a sec. I was checking the injector pulse with test light and when the engine cuts out the injectors stop pulsing. I checked tps adjustment an it's at .4v. I'm getting spark at all plugs. New spark plugs n gas. New stock injectors spray great. I switched between 3 ignitor chips n same prob. Switched in known good ecu. Same prob. Any ideas of what it could be?

02-18-2011, 08:44 AM	#2
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	check ECU for Codes If you dont know how, Search on how to do it __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

02-19-2011, 03:36 PM	#6
ll_EvOluTIoN Zilvia Member Join Date: Jan 2005 Location: Elk Grove, Killa Cali. Posts: 277 Trader Rating: (1) Feedback Score: 1 reviews	Ran codes n got 55. Checked tps it's .48v-3.8v wot. Maf is .8v key on engine off. Don't hap rpm signal do not sure if this helps but 2.8v when its idling. 3.7v at wot engine on. My vacuum/boost guage fluctuates from 4hg to 6hg wile idle goes up n down. When I rev it boost goes to about 5-6psi. So I dont think it has a boost leak. Last edited by ll_EvOluTIoN; 02-19-2011 at 03:38 PM.. Reason: More info

02-18-2011, 06:44 PM	#3
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 41 Posts: 4,829 Trader Rating: (17) Feedback Score: 17 reviews	I am the last person to suggest a maf problem but from the sounds of it (replaced ecu, replaced igniter, missing injector pulse suddenly...) it sounds like a maf issue. maybe the maf plug is loose or vibrating a bit? CAS could also be culprit as you did not mention whether spark cuts out or not. if pulse and spark dissapear then CAS/Wiring/ECU related. if just pulse then MAF probable. Because the plugs will fire as the engine rotates regardless of maf signal (right???!)

02-19-2011, 03:12 AM	#5
ll_EvOluTIoN Zilvia Member Join Date: Jan 2005 Location: Elk Grove, Killa Cali. Posts: 277 Trader Rating: (1) Feedback Score: 1 reviews	Thanks guys. Harness is brand new I'll check to make sure I'm getting correct voltage. Oh and timing is dead on lined up just in case u guys were wondering.

02-22-2011, 11:22 PM	#7
ll_EvOluTIoN Zilvia Member Join Date: Jan 2005 Location: Elk Grove, Killa Cali. Posts: 277 Trader Rating: (1) Feedback Score: 1 reviews	Bump any help?

02-28-2011, 07:36 PM	#8
ll_EvOluTIoN Zilvia Member Join Date: Jan 2005 Location: Elk Grove, Killa Cali. Posts: 277 Trader Rating: (1) Feedback Score: 1 reviews	So the injectors are cutting out. I tried a new tps n it fixed the idle for 5 min n did the same. So put a new maf and the problem goes away untill I hit the throttle. Then idles bad again. Now today no matter what I do it idles bad. Here's what I got. YouTube - Sr20det problem