Hard Start when hot after injector change out

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Aug 19, 2006 | 10:09 PM

sinepgib

Thread Starter

Heel & Toe

Joined: Jun 2006

Posts: 19

Likes: 0

From: Seaford NY

Hard Start when hot after injector change out

OK my 95 6spd Vert with 126k on the clock just got some upgrades and now I have a problem that doesn't make sense. When car is cold it lights @ the touch of the key. However once engine gets warm it's a little slow in starting 5-15 seconds and sometimes I smell raw fuel. Car otherwise is running like it has 26k on it.
I just would like to know if anyone else experienced similar problems I am leaning towards injector problem as that is the only real mechanical change but I would sure hope not.

Upgrades and repairs as follows
Corsa exhaust (wow it really seems to have woken the car up)

New Accel 26lb injectors (Summit racing)
A/C Delco fuel Filter
A/C Delco PCV valve
Intake oil leak repaired (used phenolic gaskets from guy on ebay)
Throttle body coolant bypassed
Trans oil changed ( nothing to do with related trouble)
Hurst Shifter install (what a bear to remove that X brace)
As always the input and feedback given on this forum is second to none.

Aug 19, 2006 | 10:14 PM

RRT vette

Le Mans Master

Joined: Feb 2006

Posts: 8,753

Likes: 9

From: Louisiana

Does sound like a leaky injector. I have the Accel 24 lbs and have had no problems with leaking, but have heard others dog Accel for that very reason. It is possible to have new leaky injectors. Have you pulled spark plugs to confirm a suspectious leak? Ohmed them hot and cold??

Also does it run rich??

Aug 19, 2006 | 10:27 PM

89vert

Drifting

Joined: Mar 2004

Posts: 1,504

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From: Byron Center MI

Did you have it programed for the larger injectors? This could be a problem. First thing I would do is check the fuel pressure after shutting it off and make sure it's not bleeding of to quick. Just some thoughts.

Aug 19, 2006 | 10:42 PM

sinepgib

Thread Starter

Heel & Toe

Joined: Jun 2006

Posts: 19

Likes: 0

From: Seaford NY

Good Ideas I will need to check the the plugs. I actually have a new set waiting to go in so gives me an excuse to get hands cut up again. I need to get a gauge to check the pressure. Leaky injector is what I suspect also. Glad I got them from Summit they will take the return without any grief. Anyone recommend A good rebulder for the stock injectors? I would just like to get them freshened up b4 putting back in if I have to. As far as a reprogram on the computer I wasn't aware that that would or could be an issue.

Aug 19, 2006 | 11:15 PM

cv67

Team Owner

Joined: Oct 2004

Posts: 81,241

Likes: 3,063

From: altered state

St. Jude Donor '05

I went through two sets of new Accels before going Bosch, no problems after that. Same symptoms....Some may disagree, but toss the orginal Multecs in the trash, not worth spending money on.

Aug 20, 2006 | 08:44 AM

sinepgib

Thread Starter

Heel & Toe

Joined: Jun 2006

Posts: 19

Likes: 0

From: Seaford NY

Where did you source the Bosch injectors from? I have also heard some good things about the ford injectors. Any opion on that

Aug 20, 2006 | 10:52 AM

96lt4c4

Pro

Joined: Nov 2005

Posts: 536

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From: Bardstown Kentucky

Quote:

Originally Posted by sinepgib

Upgrades and repairs as follows
Corsa exhaust (wow it really seems to have woken the car up)

I had the same problem with my 94 chevy truck after I put in a 383 with 454 injectors. The problem is your injector Base Pulse Width vs Crank. You will have to have the computer reprogramed to fix the problem. Since you have over size injectors with a stock tune the computer is dumping to much fuel when you are cranking the engine over. If you lower BPW time the engine will fire as soon as you hit the key. What this does is lowers the amount of time the injectors open when you are cranking, which means you are not dumoing as much fuel and flooding the engine.