305 TPI hard starting.
08-30-2015, 10:20 PM
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305 TPI hard starting.
OK, I'm sue there's a million of these threads, but none of them seems to be exactly like my issue.
I just bought a '86 IROC with the 305 TPI. It had this issue when I bought it and I'm trying to figure it out. It starts hard when cold and if its hot and you go to drive it again, say 15 mins later it won't start and I have to let it sit. I've checked fuel pressure and the pump doesn't run with the engine off/key on. Key on/ engine running at idle it stays at 40psi and holds it when I put the car in gear or rev engine. When I shut the engine off fuel pressure drops pretty quickly. It takes a few seconds to build pressure in the line too. When it does start I have to feather the throttle to get it to do so. Do I have a bad pump or regulator or something else? Leaking cold start injector?
Thanks
Matt
I just bought a '86 IROC with the 305 TPI. It had this issue when I bought it and I'm trying to figure it out. It starts hard when cold and if its hot and you go to drive it again, say 15 mins later it won't start and I have to let it sit. I've checked fuel pressure and the pump doesn't run with the engine off/key on. Key on/ engine running at idle it stays at 40psi and holds it when I put the car in gear or rev engine. When I shut the engine off fuel pressure drops pretty quickly. It takes a few seconds to build pressure in the line too. When it does start I have to feather the throttle to get it to do so. Do I have a bad pump or regulator or something else? Leaking cold start injector?
Thanks
Matt
08-31-2015, 08:25 PM
#2
Re: 305 TPI hard starting.
Key on/engine off the fuel pump should run. Possible problem with the fuel pump relay. ....see diagram http://austinthirdgen.org/mkportal/m...ine_wiring.gif
If there's a problem with the relay circuit, the oil pressure switch is a back up, so you need to crank the engine to get oil pressure to activate the fuel pump circuit. I'd start there.
If there's a problem with the relay circuit, the oil pressure switch is a back up, so you need to crank the engine to get oil pressure to activate the fuel pump circuit. I'd start there.
09-06-2015, 07:15 PM
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Re: 305 TPI hard starting.
Key on/engine off the fuel pump should run. Possible problem with the fuel pump relay. ....see diagram http://austinthirdgen.org/mkportal/m...ine_wiring.gif
If there's a problem with the relay circuit, the oil pressure switch is a back up, so you need to crank the engine to get oil pressure to activate the fuel pump circuit. I'd start there.
If there's a problem with the relay circuit, the oil pressure switch is a back up, so you need to crank the engine to get oil pressure to activate the fuel pump circuit. I'd start there.
I got this car for $600 cheaper than the seller's listed price because he thought it needed a new pump. A little research and a $17 relay later...FIXED! The seller claimed he was a mechanic too. LOL
Thanks!
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