Cold start problems

TYTILIDIE

TYTILIDIE

METH HEAD
We are having a cold start problem that has been there since we bought the truck in October. After we rebuilt the engine last month, I had high hopes I would find a problem in the process with going through the injectors and installing wideband and fuel pressure gauge, new CTS, all vacuum replaced, blah blah blah. Now I thought it seemed like maybe the pump wasn't holding pressure but turns out it was.

Then I thought hey, may as well replace the pump just for sure. So I buy a new pump and find this


Not sure what I will do with it but I installed the single Walbro and we still have this problem. AFR's on the wideband show lean at start up. Basically, we have to crank for a while and hit the pedal a few times to get it going. The warmer it is outside the easier the start but always have an issue. Im not sure what to look for anymore. Plugs all look equal, fuel pressure looks great, whats next?
 
TYTILIDIE

TYTILIDIE

METH HEAD
Re: Cold start problems

At the advice of another member, I checked datamaster at start to see engine temp. The truck hadn't been driven in 6 hours, outside temp was 45*, engine COLD to the touch and truck was driven approximately 2 miles before the 6 hours. Other than that last night was the last drive time.

I hooked up datamaster and engine temp key on engine off was at 132*. Started it up and after 10 miles engine temp was at 153*. The dash gauge was over the 1/4 mark which to me would usually mean about 180-200*. Of course know that gauge is worthless but usually just under the 1/4 mark is normal temp, 165-175*. So, with this info, anyone think the CTS may be bad, wrong one, etc..?

At 153* engine temp, the heater would normally not be that hot, I know this from experience. Our heater is VERY HOT!
 
QWERTYphoon

QWERTYphoon

Motley Driver Award 2009
Re: Cold start problems

My phoon sometimes doesnt want to start when cold. I just squirt some meth into it and it starts everytime. I think my issue is more about my injectors (#50). I also find it hard to start if my fuel pressure is too high. Hopes this helps.
 
WyoSyclone

WyoSyclone

Active member
Re: Cold start problems

TYTILIDIE said:
At the advice of another member, I checked datamaster at start to see engine temp. The truck hadn't been driven in 6 hours, outside temp was 45*, engine COLD to the touch and truck was driven approximately 2 miles before the 6 hours. Other than that last night was the last drive time.

I hooked up datamaster and engine temp key on engine off was at 132*. Started it up and after 10 miles engine temp was at 153*. The dash gauge was over the 1/4 mark which to me would usually mean about 180-200*. Of course know that gauge is worthless but usually just under the 1/4 mark is normal temp, 165-175*. So, with this info, anyone think the CTS may be bad, wrong one, etc..?

At 153* engine temp, the heater would normally not be that hot, I know this from experience. Our heater is VERY HOT!
Click to expand...

I'd replace the temp sender... that would definitely affect your cold start.
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: Cold start problems

If your startup ambient is 45 and your key on temp is 132 then your sensor is bad. I had similar trouble...

An open circuit would give you -58F so you have a short somewhere or a bad sensor...
 
TYTILIDIE

TYTILIDIE

METH HEAD
Re: Cold start problems

Yeah, think I pretty much verified this this morning. It was about 37* outside, hooked up DM turned the key on and it said 132*.
 
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