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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 02-18-2011, 07:49 AM   #1
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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?
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Old 02-18-2011, 08:44 AM   #2
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check ECU for Codes
If you dont know how, Search on how to do it
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Old 02-18-2011, 06:44 PM   #3
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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???!)
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Old 02-18-2011, 07:26 PM   #4
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i would also reccomend checking the wiring on your maf, loose wiring or bad solders can cause that
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Old 02-19-2011, 03:12 AM   #5
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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.
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Old 02-19-2011, 03:36 PM   #6
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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
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Old 02-22-2011, 11:22 PM   #7
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Bump any help?
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Old 02-28-2011, 07:36 PM   #8
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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
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