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Difficult start up after driving(warmup); Fires right up on the first start of the day, but I have to floor it to get it to start thereafter.
Topic Started: Nov 29 2016, 09:46 PM (1,075 Views)
HalfGeneral
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HalfGeneral
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1991 five speed three cylinder starts right up every first start of the day. After driving it to the store, in order to restart it, it is necessary for me to floor the gas pedal. Then, after it starts it takes a few seconds to catch up to all of the gas I fed it.
I replaced the fuel injector, a few weeks back, and actually noticed this behavior sometime after. It idles perfectly, it runs smooth, it does not hesitate; it only shows signs when trying to restart it after it has been driven.
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freegeo
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HalfGeneral
Nov 29 2016, 09:46 PM
1991 five speed three cylinder starts right up every first start of the day. After driving it to the store, in order to restart it, it is necessary for me to floor the gas pedal. Then, after it starts it takes a few seconds to catch up to all of the gas I fed it.
I replaced the fuel injector, a few weeks back, and actually noticed this behavior sometime after. It idles perfectly, it runs smooth, it does not hesitate; it only shows signs when trying to restart it after it has been driven.
Once you shut it off is there a certain amount of time being off before it won't start. Have you tried to shut it off and immediately start it back up?

When it won't start. Look down the throttle body with the throttle open and see if you can see gas pooled in the intake. If there is then your injector is probably leaking
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Woodie
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:gp

Sounds as if either the injector is not shutting off completely, or the O-ring around the injector is leaking.
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HalfGeneral
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HalfGeneral
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If I crank it, just after cutting it off, it fires back up with normalcy. So, what are my options, since this is a brand-new injector?
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MR1 Kingsbury
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Exp. builder/rebuilder

If you could keep the throttle open while parked, it might solve some of the excess fuel pooling. I would recheck your injector install and make sure the orings didn't get pinched or out of place. What symptoms prompted you to replace the injector in the first place?

To confirm it is flooding with fuel you could hold the pedal to the floor for a minute or 2 before trying to restart after the store stop. It might allow some fuel to vapor out before restart.
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HalfGeneral
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HalfGeneral
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Ok mr1. I'll do that. I replaced injector cause it was cutting out at higher speeds. After replacing the injector, that issue was resolved.
I guess it could be leaking. Dunno, I'll check o-ring.
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Woodie
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Look down the throttle body with a flashlight immediately after turning it off. If you see anything wet, then you've got a leak there. If it's dry, then we're completely off base.
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t3ragtop
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Turbo3 and Twincam Tweaker

this is one of the odd problems i found after battling an intermittently hot re-starting 91 i once owned.

over the years condensation that gathered in little puddles where the embossed steel intake manifold gasket lived and rusted it away. the air leak cause a fueling error.

when the engine was started cold, the initial fuel enrichment let the engine start fairly easily. after the engine was hot the induction system air leak increasingly caused issues with the injection system at startup.

if i left the car abandoned it nearly unfailingly started the next day.

an issue i had with a 92, at the transition from summer to fall i drove the car one day, and tried to start it to move it in the driveway. the car had begun to use oil and run a little slower up hills so i knew that the rings were tired. from the time i parked the car until the time i tried to start it again, a cold snap had dropped the temp about 40 degrees, enough to cause the rig gap to change the compression enough that the engine wouldn't start.

the first example required a new embossed steel intake manifold gasket and the second case required 2 new exhaust valves, piston, and rings as repairs. both conditions left fuel in puddles under the injector.
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HalfGeneral
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HalfGeneral
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Ok. I'll check to see if wet after turning off car. FYI the motor has been overhauled, practically new. Remember, I just bought a fuel injector before all this started. I suspect there is a leak, but I will check. If there is, what is my best course of action?
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MR1 Kingsbury
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clean the injector bore real well and make sure there arent any dings or edges to cut your new oring. If the injector is leaking through the internal valve, you can only replace it. warranty?
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HalfGeneral
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HalfGeneral
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Thanks mr1, that clarifies things for me. I will inspect closely. I don't know if it has a warranty I ordered it from China and it took over two weeks to get here but it was only 30 bucks. If you know of something else that is relatively cheap, I will try it.
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LesCrapp
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Seen your post here bad news is been down the cheap injector road got one leaked sent it back got one that leaked less. A trick to see if it is leaking is to take a piece of brown paper sack and fold it thin enough to fit down in the throttle body then fold the tip of it kind of like the letter "J" touch the tip of the injector after you shut it off if it gets wet you have a leaky injector. After my failed "cheapos" bit the bullet and bought Beck Arnley they are OEM repackaged did the trick good luck w/ it...
P.S. If you are REAL careful you can separate the throttle body and turn the injector side over w/ the fuel lines attached and turn the key on do not start it and let it set on for a little if you see a drop develop bingo it should stay completely dry!.. :thumb
Edited by LesCrapp, Dec 2 2016, 08:04 PM.
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HalfGeneral
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HalfGeneral
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Thanks Les. I was frayed of that. CHEAP! Although I haven't checked to see if it is leaking yet, I suspect it is.
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