Thread: Tbi 350 hard start.

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Ok so I have recently picked up an 88 k5 with a 350 tbi and have been working on it, after finally getting it running and on the road it has developed a hard start usually its difficult to start in the mornings but even after it has ran and been driven around and its warmed still don't want to start easy, sometimes even having to spray starting fluid down the tb to get it to start, was told by the previous owner and actually seen receipts on a new fuel pump and filter, also was told the ignition module was replaced, but one thing is that the previous owner had for some reason replaced the stock fuel line with rubber hose and hose clamps from the fuel filter to the tb and was thinking maybe not holding pressure? But when it runs it runs good, no misses and good power, even changed injectirs injectors and rebuilt tb so this has got me totally stumped? and any help on the situation would be greatly appreciated

didn't the early tbi and tunnel port engines have an priming injector?

Thanks for the reply, ok checked the coolent sensor, it's good, doesn't dripping from the injectors and the spark looks healthy, although I think the oil sensor for the gauge is bad because it's pegged out but if I remember correctly that's only a backup if the fuel relay goes bad? Also just noticed that the previous owner for some unknown reason had a wire connected to one of the red wires that go into fuel relay and then spliced to the purple wire on the connector for the wiper motor!? I undid all that, guessing they tried to get the wipers working? Because they never worked when I got it. I even tried another relay but still same thing but now there is that red wire hanging there and have no idea what it really went to?!

probably the priming injectors ( works sorta like a choke used to-supplies extra fuel for starting when cold((temp sensor))
You say your temp sensor is good? meaning it doesn't leak or you actually checked the resistance/temp values threwout the complete range? I hate that refrigerator/oven testing-too bad its not possible with a microwave

Well I figured out why they had that wire running from the fuel pump relay to the wipers, to give the fuel pump constant power when the key is on, so I'm guessing it would be a fuel pressure problem?