engine sputtering upon acceleration

bikerdave30 · 10-08-2008, 07:23 PM

i just replaced all my gaskets and my coolent hoses, and i put a cold air intake filter on in place of my airbox. now my car is sputtering when i accellerate. it isnt a vaccume line i made sure i put them all back to the places thay came from and double checked. anyone with any help on how to fix this problem please help.

bikerdave30 · 10-08-2008, 07:29 PM

its an 85' mr2 i ment to say that

Teado · 10-08-2008, 07:59 PM

Could be something relating to the MAF. Did you modify or move your MAF?

bikerdave30 · 10-08-2008, 08:50 PM

i donot believe so. the airfilter goes directly to the MAF and to the intake manifold

Papo J · 10-23-2008, 12:40 PM

You didn't remove the connector on the AFM itself did you? Did you reconnect the 2 small vacuum lines (AC idle up, electrical load VSV)that were connected to the hose just after the AFM?

LokiRx7 · 10-23-2008, 06:56 PM

You didnt mess with your timing did you? Did you replace your injector seals? If you pinch an injector O-ring on installation it will leak fuel, but allow your car to start. Your car will act reallly funky on acceleration after that.

Thats easy to diagnose, a strong smell of fuel, and puddles of fuel on the intake.

I would double check timing. Did you replace your Intake manifold gasket? If so make sure the TVIS is plugged in, and connected to a vacuum source.

Hey your in Cincy, I live about an hour north of there...

mr2tim · 10-24-2008, 06:25 AM

My similiar experience was a clogged fuel filter on the pump inside the gas tank.

The car started ran 10-20 seconds sputtered sometimes died, sometimes idled at 400 RPM, no acceleration what so ever. Hard starting most all the time.

Loki's injector's give the same senario's-check fuel pressure?

wp23n · 10-27-2008, 08:29 AM

im not sure how much control the computer brain had back then but on the newer vehicles you need to disconnect the battery and hold the ignition to the start position for 30 seconds to clear out the computer, once thats done reconnect the battery and drive the car for 20 minutes so the computer can relearn the changes made.

obviously with the CAI you are getting a lot more air requiring more fuel your sputtering could be that its too lean now.

10-08-2008, 07:23 PM	#1 (permalink)
bikerdave30 No Skills Join Date: Oct 2008 Location: cincinnati Posts: 8 Thanks: 1 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	engine sputtering upon acceleration i just replaced all my gaskets and my coolent hoses, and i put a cold air intake filter on in place of my airbox. now my car is sputtering when i accellerate. it isnt a vaccume line i made sure i put them all back to the places thay came from and double checked. anyone with any help on how to fix this problem please help.

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10-08-2008, 07:29 PM	#2 (permalink)
bikerdave30 No Skills Join Date: Oct 2008 Location: cincinnati Posts: 8 Thanks: 1 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	its an 85' mr2 i ment to say that

10-08-2008, 07:59 PM	#3 (permalink)
Teado MK1 = My Daily Addiction Join Date: Jun 2008 Location: Oregon Posts: 198 Thanks: 7 Thanked 9 Times in 8 Posts iTrader Rating: (0/0% )	Could be something relating to the MAF. Did you modify or move your MAF?

10-08-2008, 08:50 PM	#4 (permalink)
bikerdave30 No Skills Join Date: Oct 2008 Location: cincinnati Posts: 8 Thanks: 1 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	i donot believe so. the airfilter goes directly to the MAF and to the intake manifold

10-23-2008, 12:40 PM	#5 (permalink)
Papo J 6SPD GTE Join Date: Sep 2006 Posts: 189 Thanks: 1 Thanked 19 Times in 18 Posts iTrader Rating: (0/0% )	You didn't remove the connector on the AFM itself did you? Did you reconnect the 2 small vacuum lines (AC idle up, electrical load VSV)that were connected to the hose just after the AFM?

10-23-2008, 06:56 PM	#6 (permalink)
LokiRx7 MR2 + Flat Black = FAIL Join Date: Jan 2007 Location: N.C. Ohio Posts: 315 Thanks: 0 Thanked 15 Times in 14 Posts iTrader Rating: (1/100% )	You didnt mess with your timing did you? Did you replace your injector seals? If you pinch an injector O-ring on installation it will leak fuel, but allow your car to start. Your car will act reallly funky on acceleration after that. Thats easy to diagnose, a strong smell of fuel, and puddles of fuel on the intake. I would double check timing. Did you replace your Intake manifold gasket? If so make sure the TVIS is plugged in, and connected to a vacuum source. Hey your in Cincy, I live about an hour north of there...

10-24-2008, 06:25 AM	#7 (permalink)
mr2tim SUPERcharZed ToyZ RacZer Join Date: Mar 2008 Location: South Florida Posts: 690 Thanks: 2 Thanked 41 Times in 38 Posts My Google Map iTrader Rating: (2/100% )	My similiar experience was a clogged fuel filter on the pump inside the gas tank. The car started ran 10-20 seconds sputtered sometimes died, sometimes idled at 400 RPM, no acceleration what so ever. Hard starting most all the time. Loki's injector's give the same senario's-check fuel pressure?

10-27-2008, 08:29 AM	#8 (permalink)
wp23n Head Flunkie Join Date: Oct 2008 Location: NJ Posts: 31 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	im not sure how much control the computer brain had back then but on the newer vehicles you need to disconnect the battery and hold the ignition to the start position for 30 seconds to clear out the computer, once thats done reconnect the battery and drive the car for 20 minutes so the computer can relearn the changes made. obviously with the CAI you are getting a lot more air requiring more fuel your sputtering could be that its too lean now.