I have to pump my tpi to start it. - Team Camaro Tech
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post #1 of 6 (permalink) Old Oct 14th, 01, 02:35 PM Thread Starter
Join Date: Aug 2000
Location: athens, tx, u.s.
Posts: 7

i have a 88 350 tpi and when i need to crank it for the first time during the day i have to pump it to get it to crank. once it cranks it has no problem runnin but i thought fuel injected engines werent suppose to be pumped. could it be maybe a weak fuel relay or a weak fuel pump or a bad throttle sensor? please help
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post #2 of 6 (permalink) Old Oct 14th, 01, 02:59 PM
Join Date: Aug 1998
Location: Waldorf Md. USA
Posts: 3,280

Pony (?)
If you have to "pump" the throttle something else is wrong. There is no accelerator pump in a fuel injected motor so all you are doing is moving the throttle position sensor. There are a number of things that could be wrong, you really need a manual to diagnose the problem without wasting a lot of time and money.
Hope this helps,

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner
1973 Z-28 ..one family car...Brother bought it new in 73
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post #3 of 6 (permalink) Old Oct 14th, 01, 04:12 PM
Join Date: Jun 2001
Location: aiken,south carolina, us
Posts: 20

Hey I am not sure if this is right but I think it could be the cold start injector. That shoots the gas in the engine only when you are cranking the engine up. I have a 1988 with a 305 tpi engine. I hope this helps but if it doesn't sorry I couldn't help.

michael gunnells
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post #4 of 6 (permalink) Old Oct 14th, 01, 08:48 PM
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Join Date: May 2001
Location: Ashby,MN, USA
Posts: 8,305

you need to pump it before it will crank? or does it crank and not fire until you hit the gas? maybe the tps is out of adjustment or something.

1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16" IROC wheels
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post #5 of 6 (permalink) Old Oct 16th, 01, 10:34 AM
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Join Date: Jan 2000
Location: Houston, TX USA
Posts: 797

I posted earlier but it looks like it never appeared.. Anyway, here is my response again:
My brother had an 85 Corvette with the same symptoms. Hard to start and had to pump the pedal while cranking to get it to fire. It turns out that there are two relays to the fuel pump. An initial relay that builds fuel pressure for about 3-5 seconds when you turn your key to the "run" position and then the other relay that runs the pump while the engine is running. We finally figured out that the initial pump relay was not working and replaced just that relay and then no more problems. You can test this theory by getting as close to the gas tank as possible and have someone cycle the key between the run and off position waiting about 5 seconds in each position. When the key hits the run position you should hear the pump briefly run and then stop. If you don't hear the pump run then you know what the problem is..
Good luck

1969 Camaro SS 350-383ci./365HP, T-56, 12 bolt, Power Trax Locker, 3.73 gears, 4 whl disc, Deluxe black houndstooth interior, rear window defogger, tilt steering, floor console w/gauge package, center mntd. clock, tachometer
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post #6 of 6 (permalink) Old Oct 17th, 01, 07:51 PM Thread Starter
Join Date: Aug 2000
Location: athens, tx, u.s.
Posts: 7

the intial fuel relay is workin, i even replaced it with a new one just to make sure it wasnt weak, but it still has the same problems. i know this is part of the problem but what year did they start puttin chips in the keys, i also have an 89 rs and it has a chip, the car that were talkin about with the fuel prob is an 88 iroc. i think they started puttin them in there manditory in 89, can you help, because the 88 doesnt have a chip in the key.
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