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What sensor controls the injector Pulse?

Tiny
JULIUS RUTTY
  • MEMBER
  • 2009 SMART CAR
  • 1.0L
  • 3 CYL
  • 2WD
  • AUTOMATIC
  • 126,000 MILES
Hi, I have injector pulse for about 5 cranks, then no pulse, turn the key off, then back on has injector pulse, good spray for about 5 cranks. What sensor controls the injector that would cause this?
Monday, August 21st, 2023 AT 9:34 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
This would be the crankshaft sensor, but it sounds more like a bad PCM, SAM control unit or main relay. Have you run the codes?

This guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

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Monday, August 21st, 2023 AT 2:05 PM
Tiny
JULIUS RUTTY
  • MEMBER
  • 3 POSTS
No codes, has spark will run till injectors stop tested crank sensor test good it seems to me if the ECM sprays the injectors for 3 to 4 cranks. Why would it quit working don't have a scan tool and can't find what else could cause it with no codes.
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Tuesday, August 22nd, 2023 AT 4:28 PM
Tiny
KEN L
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It sounds like a fuel pump problem. If you turn the key on without cranking the engine over, can you hear the fuel in the tank run for about 5 seconds?
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+1
Thursday, August 24th, 2023 AT 10:36 AM
Tiny
JULIUS RUTTY
  • MEMBER
  • 3 POSTS
Well, hear what I have done so far check for spark ok check for fuel ok check for injector pulse ok check compression 150 per last time the plugs were fouled rechecked number on plug according to online wrong plug also possible stale gas added octane booster oil pressure test does read but low waiting for spark plugs and coils have no information from previous owner will try to keep posting and thanks for all the reply's will post if I figure it out can't find a lot of information online engine cranks and wants to start but won't.
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Thursday, August 24th, 2023 AT 1:02 PM
Tiny
KEN L
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If the spark plugs are fouled that could be the problem, let me know once you get it back together.
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Friday, August 25th, 2023 AT 11:44 AM

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