my 91 rs tbi takes at least 3 long cranks before it starts. it just started to do it out of nowhere. anyone know why? it just cranks and cranks til it starts finally. it's really imbarrassing. hope you can help. thank you.

 

i'd be checking the fuel supply, volumn and presure.

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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM

 

Probably the fuel sending relay. Same thing happened to me.



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Kiss_My_SS
1992 Camaro RS/Heritage Package
1996 Impala SS
1985 Good ol' Chevy 4x4 Truck

 

Same thing happened to me its the fuel pump relay most likely replace it before your pump goes out. I blew it off cause it still started and myfuel pump went out and had to replace both!

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Blue 1989 IROC Z28

 

where is the fuel pump relay? is it next to the cooling fan relay? it's the same type of relay, isn't it? how can i test it to tell if it's bad or not? thank you for the responses guys.

 

FP relay should be on the drivers side of the firewall.
bsa

 

ok, i put a new relay on it, and no good. what else can it be? i still just cranks at least 3 long times. thank you.

 

Leaky injectors would be my first guess, check the fuel pressure and see if it holds. Hope this helps.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley module, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Streetdampr, Ruger P95DC, hot wife, new oil filter, !cats, !TBC, !AIR.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

My car does the same thing if it is hot out.

If its decent out, or cool, the car starts in a second.

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1988 Jet Black IROC
5.7L W/ 64000 miles
Flowmaster Exhaust
Fully Loaded
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My IROC In Readers Rides
My IROC

 

how do you check for fuel pressure? i think it's fuel related. it is a tbi engine, and no fuel comes out at first onto the plates. finally when it does come it, it starts.

 

what can i do next???

 

what next. it's really embarrasing, especially when a mustang or other sports type car drives by and my starter is cranking for ever. plus i don't want to mess anything up or it get worse. thank you.

shawn

 

Sounds like your injectors are leaking. Start up the car, then turn it off. Take your air filter and housing off and put a cloth under the injectors, and check back in half an hour to see if the cloth has fuel on it. If so, its time to replace those injectors.

 

hmmm can you tell me how gradual this cranking thing was? i bought mine then a week later it started doingsomething like that, cept it starts on the second crank, 1st when i gas up.

 

this is how it all started. one day a few months ago i got my oil changed and from there i drove 2 blocks down the road to a radiator shop to have my coolant fan looked at. turns out, the guy was testing the wrong relay. instead of checking the fan relay, he tested the fuel pump relay. and for a temp solution that i still have, he grounded my fan relay so that the fan runs all the time when the car is on. and when i was leaving the radiator shop it started right then and there. could this be related at all? i'll try the fuel injector thing as well. thank you for the responses guys.

shawn

 

123

 

could the fuel injectors just need a good cleaning? i did the paper towl thing to check for leakage, but they didn't leak at all. could they just be really dirty to the point normal fuel injector cleaner isn't good enough? please respond.

 

ok, no one can help me out anymore with this?

 

The hard starting thing started when your mechanic grounded a wire and tested a relay?

 

Maybe this guy fried your fuel pump relay. The backup is the oil pressure switch, which closes at about 4PSI. That would explain the long cranking. Is the problem still present if you do a startup AFTER the engine has warmed up? The relay is only like $20. It couldnt hurt to replace it.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

 

yes, it started the first time i tried to start it right after he grounded that relay and tested the other relay which was the wrong one. if i start it, and let it run for a sec, turn if off and crank it again, it WILL start back right back up, but if it's sitting for a good bit, and i try to start it, it doen's start right away. i still think it's a fuel/electrical prob as to where the fuel isn't comming out right away. i notice once the oil pressure gets up to about 30, i'll start. i put a new fuel relay on and it's still not helping, unless the new relay is bad as well. maybe i should take it back for another one just for the hell of it.

 

is there anyway to check to see if the relay is bad or not, besides buying a new one? also, the fan relay and the fuel pump relay are the same type of relays right? could i just take my fan relay off since i know that works to try it on the fuel relay? thank you.

[This message has been edited by camaro 22 (edited September 25, 2001).]

 

Pull out your ignition module and go test it at a parts place.

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"Question with boldness even the existence of a *** ; because, if there be one, he must more approve of the homage of reason, than that of blind-folded fear."

-Thomas Jefferson