I have a customer with a 88 all stock. Car would not start on its own unless he sprayed some starting fluid in. His mechanic diagnosed clogged injectors. Ign system is fine. He bought new ones from us and the car still does the same thing. I went through some tests with him so far. Checked all sensors, timing, fuel pressure, injector pulse, maf, maf burnoff, and reset tps. and IAC. Car has pleanty of spark. The only thing we could find not right was the cold start valve had no power. We checked again this morning on a cold engine and during cranking there is no voltage at the CSV. My question is: what supplies power to the CSV and when. Is there a relay. I do not have a FSM and either does he. Thanks
Jon

 

I have limited experience with a cold start valve, but don't recall any relay for them. I have a F-body diagram, will try to send the link.
http://www.austinthirdgen.org/mkport...ine_wiring.gif

Joel

 

Jon COld start is an injector and a sensor on the front of the intake

Agent86 has a pdf he might be able to post a link to

 

Hi Jon,

Here is a 1986 corvette manual in adobe pdf format on my website. It's huge so it'll take a while to download.

I'm almost sure that the ecm will supply signal to power up the cold start valve.

I think 1986-1988 used the same design and that in 1989 GM deleted the csv in favor of better programming using the main injectors.

Good luck! Thanks for your help and GREAT videos by the way.

Lee

http://www.labib.com/c4manual.pdf

 

thanks joel.. the scematic shows that there is a cold start switch powered by a hot on start wire that is fused with a 3 amp fuse.. now all I need to know is where is the cold start switch and if the fuse is in the reg fuse panel

 

'85 - '88 use a cold start injector....In 1989 the cold start injector was deleted. The calibrator provides a wider pulse width on startup to provide a richer mixture for a cold engine. All other features are the same. So the '86 book will work for the '88 on this.....Looking at the diagram the thermo switch might be bad in this '88.

Some excerpts from:http://www.fuelinjection.com/portinj.html

When the starter is engaged and the coolant temperature is less than 100 deg F. The cold start injector provides a spray of fuel, of 8 seconds duration max, to each cylinder via a air distribution system built into the intake manifold. If the engine temperature is greater than 100 deg F, the cold start injector is disabled by the cold start switch. Upon startup the ECM utilizes information in the calibrator to establish the initial pulse rate for the injectors and the engine starts. At this time the engine is operating in open loop mode and will continue to do so until the engine warms up. After the warm up period the ECM scans the sensors, if all sensors are operating and within their proper range, the engine then goes into closed loop operation. This means that the sensors are dynamically controlling the engine. In the event the information received is higher or lower than the normal range, a code will set in the ECM, and the Check Engine or Service Engine Soon light will come "on". The ECM receives information on air flow, engine temperature, air temperature, exhaust gas oxygen content and throttle position. This information is used to calculate the proper pulse width for the injectors and fires the injectors for the calculated period. This procedure is repeated continuously in very rapid sequence to maintain the optimum fuel air ratio.


Good Luck and keep up the good work Jon!

 

thanks.. i took on a customer service nightmare.. The customer is from Montreal, Only speaks french. My daughter who speaks french is translating his emails. We are doing ok, but, i'm trying to locate the power source for the CSV. We know it should have 12 volts at start up. He has wired a voltmeter right to the cold start. There is zero volts at cold crank. I think this is his problem as it runs perfectly once it fires. So, to see if this is his problem I had him take out the CSV and power it up with a hot wire and crank the engine with the ign disconected. it does spray. Then I had him put back in the valve and I had him rig up a pushbuton switch to power the valve. Just e mailed back.. It starts when he pushes the button, after it starts he released it and it runs fine, So, the CSV is the problem. Now how do we find the switch and fuse so he can get rid of the manual switch.
sorry for this one, but its part of the business.

 

The cold start switch goes into the water jacket on the front of the engine near the coolant temp sensor.

 

thanks Ed.. now how do you say that in french. My daughter went to sleep.

 

Clickage

 

It shows a fuse labeled C INJ but I don't know where it is.

 

I said it 2 hours ago

 

How do you imbed a link like that?

 

Highlight the word you want to make clickable, then click the little globe icon of the reply box. In that new box paste your destination URL that you want the clickable word to take you to.

 

Cool! Thanks!

 

can't believe i missed it.. to busy with the e mails.. i think we got it..the last link was great
thanks to all I really appreciate the help.

 

It's on the auxillary fuse block. It's hidden behind DIC display, near starter enable relay. It's just off picture to the center left in pic below by where those thick pink wires are.

 

perfect.. Now I got the whole system.. No problem. Thanks again
Jon

 

You can also send the customer this link, if he does not know how to take the dash apart and needs to get to the fuse. Step by step pics.


http://www.joestradingpost.com/vats/89_startrelay.htm

 

done
thanks